Presentazione della Dott.ssa Eura Quattrone per una lezione su suono ed equilibrio alle classi quinte della scuola primaria Padre Marco d'Aviano del 2° Circolo di Pordenone
Este documento es la tercera edición del libro Fundamentos de Circuitos Eléctricos. Presenta conceptos básicos de circuitos eléctricos y contiene 14 capítulos organizados en tres partes que cubren análisis de cd, análisis de ca y análisis avanzado. Incluye ejemplos y problemas resueltos para ayudar a los estudiantes a comprender los fundamentos de los circuitos eléctricos.
The document discusses various topics related to electromagnetic radiation and quantum mechanics including:
1. Neon signs glow different colors due to gases emitting light at characteristic wavelengths when an electric current passes through.
2. The electromagnetic spectrum consists of radiation with a broad range of wavelengths, including visible light, ultraviolet light, infrared light, microwaves and more.
3. Albert Einstein's photon theory explained the photoelectric effect where photons with sufficient energy can eject electrons from metals.
The Stark effect is the splitting and shifting of spectral lines in atoms and molecules due to an external electric field. Johannes Stark discovered the effect in 1913 when he observed the spectral lines of hydrogen split into symmetrically spaced components under an electric field. The amount of splitting or shifting is quantified as the Stark shift or splitting. The effect occurs due to the interaction of the electric field with the charged particles in the atom, causing a perturbation to the electron orbitals and thus changing the energy levels.
Rietveld refinement is a widely used technique for determining crystal structures and quantifying crystalline materials from powder diffraction data. It works by minimizing the difference between observed and calculated diffraction patterns using least squares refinement. Key aspects include modeling the background, peak shape, unit cell parameters, atomic positions, and other structural details. Common software packages are used to perform the iterative refinement calculations.
Short Channel Effects are governed by complex physical phenomena and mainly Influenced because of both vertical and horizontal electric field components.
To meet the current requirements of
Electronic devices, the miniaturization of devices is important. And so is Second Order effects which otherwise degrade the performance of devices.
X-ray photoelectron spectroscopy (XPS) is a surface-sensitive technique that uses X-rays to eject core electrons from the surface of a material. The kinetic energy of the ejected electrons is measured to identify the elemental composition of the outermost layers of the material. XPS is based on the photoelectric effect discovered by Einstein and was developed in the 1960s by Kai Siegbahn and his research group. It functions under ultra-high vacuum and allows identifying elements, chemical states, and empirical formulas of the top 1-10 nm of materials.
To find the susceptibility arising due to water in the solution of MnCl2 , ionic molecular susceptibility ,magnetic moment of the Mn++ using quinche's Method
This document discusses powder X-ray diffraction (XRD), including Miller indices for describing crystal planes, Bragg's law relating diffraction and plane spacing, systematic absences due to crystal structure, determining structure from XRD patterns, and applications and limitations of the technique. Key components of an XRD diffractometer are described. The process of indexing diffraction patterns to determine the unit cell type and parameters is outlined.
Este documento es la tercera edición del libro Fundamentos de Circuitos Eléctricos. Presenta conceptos básicos de circuitos eléctricos y contiene 14 capítulos organizados en tres partes que cubren análisis de cd, análisis de ca y análisis avanzado. Incluye ejemplos y problemas resueltos para ayudar a los estudiantes a comprender los fundamentos de los circuitos eléctricos.
The document discusses various topics related to electromagnetic radiation and quantum mechanics including:
1. Neon signs glow different colors due to gases emitting light at characteristic wavelengths when an electric current passes through.
2. The electromagnetic spectrum consists of radiation with a broad range of wavelengths, including visible light, ultraviolet light, infrared light, microwaves and more.
3. Albert Einstein's photon theory explained the photoelectric effect where photons with sufficient energy can eject electrons from metals.
The Stark effect is the splitting and shifting of spectral lines in atoms and molecules due to an external electric field. Johannes Stark discovered the effect in 1913 when he observed the spectral lines of hydrogen split into symmetrically spaced components under an electric field. The amount of splitting or shifting is quantified as the Stark shift or splitting. The effect occurs due to the interaction of the electric field with the charged particles in the atom, causing a perturbation to the electron orbitals and thus changing the energy levels.
Rietveld refinement is a widely used technique for determining crystal structures and quantifying crystalline materials from powder diffraction data. It works by minimizing the difference between observed and calculated diffraction patterns using least squares refinement. Key aspects include modeling the background, peak shape, unit cell parameters, atomic positions, and other structural details. Common software packages are used to perform the iterative refinement calculations.
Short Channel Effects are governed by complex physical phenomena and mainly Influenced because of both vertical and horizontal electric field components.
To meet the current requirements of
Electronic devices, the miniaturization of devices is important. And so is Second Order effects which otherwise degrade the performance of devices.
X-ray photoelectron spectroscopy (XPS) is a surface-sensitive technique that uses X-rays to eject core electrons from the surface of a material. The kinetic energy of the ejected electrons is measured to identify the elemental composition of the outermost layers of the material. XPS is based on the photoelectric effect discovered by Einstein and was developed in the 1960s by Kai Siegbahn and his research group. It functions under ultra-high vacuum and allows identifying elements, chemical states, and empirical formulas of the top 1-10 nm of materials.
To find the susceptibility arising due to water in the solution of MnCl2 , ionic molecular susceptibility ,magnetic moment of the Mn++ using quinche's Method
This document discusses powder X-ray diffraction (XRD), including Miller indices for describing crystal planes, Bragg's law relating diffraction and plane spacing, systematic absences due to crystal structure, determining structure from XRD patterns, and applications and limitations of the technique. Key components of an XRD diffractometer are described. The process of indexing diffraction patterns to determine the unit cell type and parameters is outlined.
Werner Heisenberg developed the uncertainty principle, which states that the more precisely the position of a particle is determined, the less precisely its momentum can be known, and vice versa. This stems from the quantum nature of matter, where measuring devices disturb the system being measured. A thought experiment is described where observing an electron's position with a photon impacts the electron's momentum in an unpredictable way. The uncertainty principle is expressed as ΔxΔp≥h/2π, meaning the product of the uncertainties in position and momentum must be greater than or equal to Planck's constant divided by 2π.
Semiconductores intrínsecos y los semiconductores dopadosUniversidad Telesup
Este documento describe los semiconductores intrínsecos y dopados. Explica que los semiconductores intrínsecos como el silicio y germanio tienen una pequeña concentración de electrones y huecos que les permite conducir electricidad. Los semiconductores dopados tienen átomos impuros que aumentan la concentración de electrones (tipo n) o huecos (tipo p), mejorando su conductividad. También describe las uniones p-n, donde los semiconductores p y n se unen, creando una zona de agotamiento que permite o bloquea el
This article gives a vivid description of the principle and working procedure of a Light Emitting Diode. It provides a comprehensive understanding of how this very important optical device is useful in our daily applications, its types, structure and other related information.
Bound states in 1d, 2d and 3d quantum wellsAhmed Aslam
This document discusses simulations of bound states in 1D, 2D, and 3D finite potential wells. For 1D wells, the finite difference method was used to solve the Schrodinger equation and obtain energy eigenvalues and eigenfunctions. For 2D wells, spline interpolation was employed. Bound states in 3D cubic and spherical wells were determined by solving the radial Schrodinger equation involving Bessel functions. The programs yielded plots of eigenfunctions and energy levels demonstrating bound states in wells of varying dimensions.
This document summarizes Maxwell's equations for static and time-varying electric and magnetic fields. It presents the equations in both integral and differential forms. Maxwell's equations for static fields are summarized in a table. For time-varying fields, Faraday's law relates the electromotive force to the time rate of change of magnetic flux. Ampere's law includes both conduction and displacement currents. Gauss' laws for electric and magnetic fields remain the same as in the static case.
This document discusses nonlinear optics and the dynamical Berry phase. It introduces nonlinear optics and summarizes early experiments. It then discusses how the Berry phase is related to nonlinear optical effects like second harmonic generation (SHG). Computational methods are presented for calculating SHG and other nonlinear optical properties from first principles using time-dependent density functional theory and the dynamical Berry phase. Examples of applying these methods to study SHG in semiconductors are provided.
1) The document discusses the quantum theory of light and the photoelectric effect. It describes experiments by Lenard and Einstein's explanation of the photoelectric effect using the idea that light is composed of quanta called photons.
2) Einstein proposed that photons transfer all of their energy to electrons in packets. Higher frequency photons transfer more energy, allowing electrons to escape metals with higher kinetic energy.
3) The maximum kinetic energy of photoelectrons depends on the photon frequency and the work function of the metal, with the work function representing the minimum energy needed to remove an electron from the metal.
This document reviews single-photon sources and detectors. It discusses the characteristics of ideal single-photon sources and describes current technologies for deterministic and probabilistic single-photon sources, including quantum dots, color centers, and parametric downconversion. It also provides a brief history of single-photon detectors from photomultiplier tubes to avalanche photodiodes and reviews their applications in quantum information science and other fields.
This document appears to be a cover page for a practical paper submission from a student named Anmol, who is presenting to Prof. Kamal Kishore. Anmol is an M.Sc. Chemistry student in their 3rd semester with a roll number of 4853, submitting a practical paper in February 2021 for the code 516 course.
This document discusses metal-semiconductor contacts and the electrical characteristics of Schottky diodes. It describes how metal-semiconductor contacts are classified based on the work function difference between the metal and semiconductor, and whether they form Schottky or Ohmic contacts. It then provides details on the Poisson equation used to model Schottky diodes and derive expressions for key parameters like built-in potential, space-charge width, maximum electric field, and junction capacitance. Finally, it discusses how the Schottky barrier height can be lowered due to image force effects.
This theory, developed by Bardeen, Cooper and Schrieffer, states that electrons experience an attractive interaction through the lattice that overcomes their normal repulsive interaction, forming Cooper pairs. At low temperatures, these pairs move without resistance through the lattice, causing the material to become a superconductor. The electron-lattice-electron interaction must be stronger than the direct electron-electron interaction for superconductivity to occur.
The document discusses X-ray diffraction and crystallography. It begins by providing background on the discovery of X-rays by Wilhelm Röntgen in 1895. It then describes how X-rays are produced and their properties, including their short wavelength and ability to penetrate materials. A key section explains how X-ray diffraction occurs when crystals act as diffraction gratings for X-rays due to their periodic structure. Bragg's law is also summarized, relating the diffraction condition to the wavelength and angle of the X-rays scattering from the crystal lattice planes. The document overall provides an introduction to X-ray diffraction techniques used to study crystal structures.
Determine Planck constant using the photoelectric effect.UCP
This document describes an experiment to determine Planck's constant using the photoelectric effect. A phototube apparatus with different color filters is used to measure the maximum kinetic energy of electrons emitted from a metal surface when illuminated by light of varying frequencies. The results show a linear relationship between stopping potential and light frequency, from which Planck's constant and the work function of the metal can be extracted. The experiment verifies Einstein's explanation of the photoelectric effect and provides a method to calculate Planck's constant.
This document provides an overview of classical and quantum free electron theories of metals. The classical theory postulates that valence electrons in metals are free and move randomly, colliding with ions. When an electric field is applied, free electrons drift in the opposite direction. The quantum theory assumes electrons have wave-like properties and their energy levels are quantized. The classical theory can explain electrical and thermal conductivity but fails to explain various quantum effects. The quantum theory resolves issues like temperature-independent paramagnetism.
Este documento presenta conceptos básicos sobre circuitos eléctricos de corriente directa, incluidas las conexiones en serie y en paralelo de resistores, y cómo calcular la resistencia equivalente, corriente y voltaje en circuitos simples y complejos. Explica que la resistencia equivalente para resistores en serie es la suma de las resistencias individuales, mientras que para resistores en paralelo es la inversa de la suma de las inversas de cada resistencia. También cubre las leyes de Kirchhoff para analizar circuitos con múltiples trayector
Mössbauer spectroscopy uses the recoil-free emission and absorption of gamma rays to study the chemical environment of atomic nuclei. It provides information on oxidation states, ligands, and magnetic properties by analyzing isomer shifts, quadrupole splitting, and magnetic splitting in spectra. Applications of Mössbauer spectroscopy include distinguishing between chemical complexes, studying iron proteins, identifying corrosion products, analyzing geological samples, and performing in situ analyses on other planets.
The document provides an overview of quantum entanglement, including:
- Entangled particles cannot be described independently and must be described as a whole system. Measurements of one particle seem to instantaneously influence the other, even when separated by large distances.
- Early pioneers like Einstein, Schrodinger, and Podolsky struggled to understand entanglement and viewed it as evidence that quantum mechanics was incomplete.
- A 2015 experiment at Delft University was the first to close all loopholes in verifying Bell's theorem and violations of local realism, providing strong evidence that entanglement involves truly non-local correlations.
- Potential applications of entanglement include quantum cryptography, where entangled particles allow secure communication without a
The Raman effect was discovered in 1928 by Indian scientist C.V. Raman. When light interacts with molecules, most light is scattered at the same frequency as the incident light (Rayleigh scattering) but a small amount is scattered at shifted frequencies. This shifted light is called the Raman effect. There are three types of scattered light - Rayleigh lines have the same frequency, Stokes lines have lower frequencies, and anti-Stokes lines have higher frequencies. Raman spectroscopy analyzes these scattered light frequencies to identify molecules based on their vibrational and rotational states.
Este informe presenta los resultados de un experimento sobre inducción electromagnética utilizando imanes y bobinas. Se estudió cómo variaba la corriente inducida al mover imanes a través de bobinas y cómo cambiaba el voltaje de salida de un transformador al variar el número de espiras del secundario. Los resultados mostraron que la corriente inducida aumenta con la velocidad del imán y su intensidad magnética, y que el voltaje de salida de un transformador depende directamente de la relación entre el número de espiras del primario
Generadores y dispositivos semiconductores de microondas (3)Nicolas Cuya Motta
Este documento describe diferentes tipos de generadores de microondas, incluyendo magnetrones, klistrones y tubos de ondas progresivas. Explica sus principios de funcionamiento basados en la modulación de la velocidad de electrones, así como sus usos comunes como osciladores, amplificadores y en aplicaciones como radar y hornos de microondas.
Werner Heisenberg developed the uncertainty principle, which states that the more precisely the position of a particle is determined, the less precisely its momentum can be known, and vice versa. This stems from the quantum nature of matter, where measuring devices disturb the system being measured. A thought experiment is described where observing an electron's position with a photon impacts the electron's momentum in an unpredictable way. The uncertainty principle is expressed as ΔxΔp≥h/2π, meaning the product of the uncertainties in position and momentum must be greater than or equal to Planck's constant divided by 2π.
Semiconductores intrínsecos y los semiconductores dopadosUniversidad Telesup
Este documento describe los semiconductores intrínsecos y dopados. Explica que los semiconductores intrínsecos como el silicio y germanio tienen una pequeña concentración de electrones y huecos que les permite conducir electricidad. Los semiconductores dopados tienen átomos impuros que aumentan la concentración de electrones (tipo n) o huecos (tipo p), mejorando su conductividad. También describe las uniones p-n, donde los semiconductores p y n se unen, creando una zona de agotamiento que permite o bloquea el
This article gives a vivid description of the principle and working procedure of a Light Emitting Diode. It provides a comprehensive understanding of how this very important optical device is useful in our daily applications, its types, structure and other related information.
Bound states in 1d, 2d and 3d quantum wellsAhmed Aslam
This document discusses simulations of bound states in 1D, 2D, and 3D finite potential wells. For 1D wells, the finite difference method was used to solve the Schrodinger equation and obtain energy eigenvalues and eigenfunctions. For 2D wells, spline interpolation was employed. Bound states in 3D cubic and spherical wells were determined by solving the radial Schrodinger equation involving Bessel functions. The programs yielded plots of eigenfunctions and energy levels demonstrating bound states in wells of varying dimensions.
This document summarizes Maxwell's equations for static and time-varying electric and magnetic fields. It presents the equations in both integral and differential forms. Maxwell's equations for static fields are summarized in a table. For time-varying fields, Faraday's law relates the electromotive force to the time rate of change of magnetic flux. Ampere's law includes both conduction and displacement currents. Gauss' laws for electric and magnetic fields remain the same as in the static case.
This document discusses nonlinear optics and the dynamical Berry phase. It introduces nonlinear optics and summarizes early experiments. It then discusses how the Berry phase is related to nonlinear optical effects like second harmonic generation (SHG). Computational methods are presented for calculating SHG and other nonlinear optical properties from first principles using time-dependent density functional theory and the dynamical Berry phase. Examples of applying these methods to study SHG in semiconductors are provided.
1) The document discusses the quantum theory of light and the photoelectric effect. It describes experiments by Lenard and Einstein's explanation of the photoelectric effect using the idea that light is composed of quanta called photons.
2) Einstein proposed that photons transfer all of their energy to electrons in packets. Higher frequency photons transfer more energy, allowing electrons to escape metals with higher kinetic energy.
3) The maximum kinetic energy of photoelectrons depends on the photon frequency and the work function of the metal, with the work function representing the minimum energy needed to remove an electron from the metal.
This document reviews single-photon sources and detectors. It discusses the characteristics of ideal single-photon sources and describes current technologies for deterministic and probabilistic single-photon sources, including quantum dots, color centers, and parametric downconversion. It also provides a brief history of single-photon detectors from photomultiplier tubes to avalanche photodiodes and reviews their applications in quantum information science and other fields.
This document appears to be a cover page for a practical paper submission from a student named Anmol, who is presenting to Prof. Kamal Kishore. Anmol is an M.Sc. Chemistry student in their 3rd semester with a roll number of 4853, submitting a practical paper in February 2021 for the code 516 course.
This document discusses metal-semiconductor contacts and the electrical characteristics of Schottky diodes. It describes how metal-semiconductor contacts are classified based on the work function difference between the metal and semiconductor, and whether they form Schottky or Ohmic contacts. It then provides details on the Poisson equation used to model Schottky diodes and derive expressions for key parameters like built-in potential, space-charge width, maximum electric field, and junction capacitance. Finally, it discusses how the Schottky barrier height can be lowered due to image force effects.
This theory, developed by Bardeen, Cooper and Schrieffer, states that electrons experience an attractive interaction through the lattice that overcomes their normal repulsive interaction, forming Cooper pairs. At low temperatures, these pairs move without resistance through the lattice, causing the material to become a superconductor. The electron-lattice-electron interaction must be stronger than the direct electron-electron interaction for superconductivity to occur.
The document discusses X-ray diffraction and crystallography. It begins by providing background on the discovery of X-rays by Wilhelm Röntgen in 1895. It then describes how X-rays are produced and their properties, including their short wavelength and ability to penetrate materials. A key section explains how X-ray diffraction occurs when crystals act as diffraction gratings for X-rays due to their periodic structure. Bragg's law is also summarized, relating the diffraction condition to the wavelength and angle of the X-rays scattering from the crystal lattice planes. The document overall provides an introduction to X-ray diffraction techniques used to study crystal structures.
Determine Planck constant using the photoelectric effect.UCP
This document describes an experiment to determine Planck's constant using the photoelectric effect. A phototube apparatus with different color filters is used to measure the maximum kinetic energy of electrons emitted from a metal surface when illuminated by light of varying frequencies. The results show a linear relationship between stopping potential and light frequency, from which Planck's constant and the work function of the metal can be extracted. The experiment verifies Einstein's explanation of the photoelectric effect and provides a method to calculate Planck's constant.
This document provides an overview of classical and quantum free electron theories of metals. The classical theory postulates that valence electrons in metals are free and move randomly, colliding with ions. When an electric field is applied, free electrons drift in the opposite direction. The quantum theory assumes electrons have wave-like properties and their energy levels are quantized. The classical theory can explain electrical and thermal conductivity but fails to explain various quantum effects. The quantum theory resolves issues like temperature-independent paramagnetism.
Este documento presenta conceptos básicos sobre circuitos eléctricos de corriente directa, incluidas las conexiones en serie y en paralelo de resistores, y cómo calcular la resistencia equivalente, corriente y voltaje en circuitos simples y complejos. Explica que la resistencia equivalente para resistores en serie es la suma de las resistencias individuales, mientras que para resistores en paralelo es la inversa de la suma de las inversas de cada resistencia. También cubre las leyes de Kirchhoff para analizar circuitos con múltiples trayector
Mössbauer spectroscopy uses the recoil-free emission and absorption of gamma rays to study the chemical environment of atomic nuclei. It provides information on oxidation states, ligands, and magnetic properties by analyzing isomer shifts, quadrupole splitting, and magnetic splitting in spectra. Applications of Mössbauer spectroscopy include distinguishing between chemical complexes, studying iron proteins, identifying corrosion products, analyzing geological samples, and performing in situ analyses on other planets.
The document provides an overview of quantum entanglement, including:
- Entangled particles cannot be described independently and must be described as a whole system. Measurements of one particle seem to instantaneously influence the other, even when separated by large distances.
- Early pioneers like Einstein, Schrodinger, and Podolsky struggled to understand entanglement and viewed it as evidence that quantum mechanics was incomplete.
- A 2015 experiment at Delft University was the first to close all loopholes in verifying Bell's theorem and violations of local realism, providing strong evidence that entanglement involves truly non-local correlations.
- Potential applications of entanglement include quantum cryptography, where entangled particles allow secure communication without a
The Raman effect was discovered in 1928 by Indian scientist C.V. Raman. When light interacts with molecules, most light is scattered at the same frequency as the incident light (Rayleigh scattering) but a small amount is scattered at shifted frequencies. This shifted light is called the Raman effect. There are three types of scattered light - Rayleigh lines have the same frequency, Stokes lines have lower frequencies, and anti-Stokes lines have higher frequencies. Raman spectroscopy analyzes these scattered light frequencies to identify molecules based on their vibrational and rotational states.
Este informe presenta los resultados de un experimento sobre inducción electromagnética utilizando imanes y bobinas. Se estudió cómo variaba la corriente inducida al mover imanes a través de bobinas y cómo cambiaba el voltaje de salida de un transformador al variar el número de espiras del secundario. Los resultados mostraron que la corriente inducida aumenta con la velocidad del imán y su intensidad magnética, y que el voltaje de salida de un transformador depende directamente de la relación entre el número de espiras del primario
Generadores y dispositivos semiconductores de microondas (3)Nicolas Cuya Motta
Este documento describe diferentes tipos de generadores de microondas, incluyendo magnetrones, klistrones y tubos de ondas progresivas. Explica sus principios de funcionamiento basados en la modulación de la velocidad de electrones, así como sus usos comunes como osciladores, amplificadores y en aplicaciones como radar y hornos de microondas.
Presentazione PowerPoint sulle oscillazioni, le onde meccaniche e il suono. Basata sul libro di testo "Fisica e realtà.blu con interactive e-book - Onde" di Claudio Romeni. Il materiale esposto in questa presentazione è stato elaborato a fine didattico come un compito per casa.
This document discusses post-impressionist theories of vision and perception. It references several key figures such as Michel-Eugène Chevreul who studied the interaction of colored light, as well as Charles Blanc, Odgen Rood, and Charles Henry who contributed to understanding how the eye and brain work together in visual processing.
The document introduces the "Beauty and the Beasts / Ecodesign" team which includes 4 members - Luca Diamanti, Marco Zemolin, Bruno La Versa, and Isabella Peruzzi. It lists their roles and the software they use. The core skills of the team are described as coordination, accuracy, creativity, and diligence.
Presentazione preparata dall'Associazione Culturale Agora Zoé per il laboratorio destinato alle scuole "Alluminio: nuovo oro" nell'ambito del Progetto di comunicazione ed educazione sul tema dei Rifiuti Urbani per la Sostenibilità Ambientale
Metodi e strumenti utili per i DSA nei compiti a casaLoretta Danelon
slides relative alla relazione curata da Maria Rosa Bianchi, Chiara Pastomerlo e Marco Quaglino in occasione di un incontro dal titolo "Metodi e strumenti utili per i DSA nei compiti a casa: suggerimenti ed esperienze", organizzato dalla sezione AID di Como
Presentazione sulla cultura dei castellieri in Friuli Venezia Giulia preparata per le classi quinte della scuola primaria Padre Marco d'Aviano del 2° Circolo di Pordenone
Serie di diapositive preparate per indicare le possibili fermate del Pedibus con relative criticità e migliorie da presentare all\'amministrazione comunale
4. L'orecchio esterno convoglia i suoni nel canale uditivo che condensa le onde sonore. Le onde sonore colpiscono la membrana timpanica e la fanno vibrare.
5.
6.
7.
8.
9.
10.
11. L'orecchio interno è formato dalla coclea, una struttura a forma di conchiglia contenente liquido, fornita di cellule cigliate. Ogni cellula cigliata risponde a frequenze diverse, e consente di captare una gamma di suoni alti e bassi. Le cellule cigliate, quando sono stimolate, inviano impulsi nervosi al nervo acustico e quindi al cervello.
19. MA IL RUMORE SI SENTE ANCHE IN MANIERA DIFFERENTE (con varie TONALITA’)? Si è vero, come i colori sono tanti e più o meno intensi anche il rumore si differenzia con toni diversi: - Ci sono rumori più cupi (FREQUENZE BASSE) - Ci sono rumori più elevati (FREQUENZE ALTE) Noi sentiamo molto bene i toni medi (le frequenze con cui parliamo).
20. EFFETTI DEL RUMORE. - Innanzi tutto sentire il rumore ci permette di interagire con il mondo. - A volte il rumore ci fa fare alcune cose, scappare se c’è pericolo, ballare se ci piace il ritmo della musica. - Tuttavia il rumore molto alto può provocare dei danni all’organo dell’udito (come se guardiamo una luce molto intensa) - un’esposizione per lunghi periodi ad un livello di 80 - 90 dB può farci perdere l’udito alle frequenze che sentiamo meglio. - Se il rumore supera i 130 - 140 dB (SCOPPIO) può addirittura lesionare il timpano. AA volte invece succede che un livello di pressione sonora di 50 – 60 dB nell’ambiente non ci permetta di dormire. Rumori intorno a 40 – 50 dB non permettano la concentrazione (ad esempio: risolvere un problema di geometria).
21. LA LEGGE ITALIANA INDIVIDUA ZONE IN CUI: La quiete è essenziale (scuole e ospedali) Si possano costruire case (zone residenziali) Si possano costruire fabbriche (zone industriali) In più indica limiti per i rumori prodotti da aeroplani, treni, strade, discoteche, piste di gara ed altre sorgenti sonore.