Ultraviolet eng
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This document discusses different devices that can be used to detect ultraviolet radiation, including photodiodes and photomultiplier tubes. It also describes the wavelength ranges of ultraviolet radiation, including UVA, UVB, and UVC. Exposure to UV rays can affect the human body, and UV radiation has various applications like disinfection, medical imaging, and curing polymers.
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Instrumentation of uv spectrophotometer pranav kumar singh
This document discusses the components and operation of a UV spectrophotometer. It describes the main components as the source, wavelength selector, sample container, detector, and readout. It provides details on common sources like deuterium arc lamps, tungsten lamps, and xenon arc lamps. It also discusses wavelength selector devices like monochromators and filters. The document outlines the applications of UV spectrophotometry in areas like detection of impurities, structure elucidation, and quantitative analysis. In under 3 sentences.
Electromagnetic spectrum.ppt
Electromagnetic waves travel as vibrations in electric and magnetic fields and include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. They are arranged in order of increasing frequency and decreasing wavelength in the electromagnetic spectrum. Electromagnetic waves have various properties including speed, frequency, wavelength, and energy level, with higher frequency waves having higher energy. Different types of electromagnetic waves are used for various applications such as communication technologies, cooking, medical imaging, sterilization, and radiation therapy.
SPECTROSCOPY.pdf
Spectroscopy involves analyzing the interaction of electromagnetic radiation with matter. Different regions of the electromagnetic spectrum are used to study different types of molecular motion and structure. UV-visible spectroscopy analyzes electronic transitions that occur when molecules absorb ultraviolet or visible light. The wavelength and intensity of absorbed light provides information about functional groups and molecular structure. Key concepts in UV-visible spectroscopy include chromophores, which are functional groups that absorb light in characteristic regions, and Beer's law, which states that absorbance is proportional to concentration.
Electromagnetic waves
definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
G10 electromagneticwaves.pdf
Electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. They are formed by oscillating electric and magnetic fields and travel at the speed of light. Different types of electromagnetic waves interact with matter in different ways depending on their wavelength. Many parts of the electromagnetic spectrum are used in medicine for applications like MRI, infrared therapy, ultrasound, X-rays, and PET scans.
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Ultra violet spectrometer
UV-visible spectroscopy uses light in the UV and visible regions to analyze molecular structure. The main components of a UV-visible spectrometer are a light source, wavelength selector like a monochromator, sample cell, detector, and recorder. Common light sources include hydrogen, deuterium, and tungsten lamps. Filters or monochromators are used to select wavelengths, and samples are placed in cuvettes. Detectors measure light intensity and are connected to a recorder. Double beam spectrometers have advantages over single beam in compensating for instrument fluctuations.
Application of electromagnetic waves.pptx
- Radio waves are used for communication like radio and television broadcasting. They have the longest wavelengths and are produced by vibrating electrons in an antenna.
- Microwaves have shorter wavelengths than radio waves and are used for applications like satellite communications, radar, cell phones, and microwave ovens. They can penetrate the atmosphere to enable satellite communication and their short wavelengths allow them to be reflected by small objects for radar.
- Infrared, visible light, ultraviolet, X-rays, and gamma rays are all parts of the electromagnetic spectrum with increasingly shorter wavelengths and higher frequencies and energies. They have various applications in areas like photography, medical imaging, sterilization, and cancer treatment.
Vacuum UV & UV-Vis Wavelength
Ultraviolet light lies just outside the range of visible light our eyes can detect. Its wavelengths are shorter and higher energy than visible light. Even though our eyes can’t directly detect ultraviolet light, we can see its effects
Ultraviolet radiation
(1) Ultraviolet radiations are electromagnetic energy between visible light and X-rays that are invisible to the human eye but transmit more energy than visible light. (2) They are produced by the sun or medical generators using mercury and emitted in UVA, UVB, or UVC wavelengths. (3) While ultraviolet radiation has physiological effects like vitamin D production and antibacterial properties, overexposure can cause erythema, skin cancer, and photoaging.
Electromagnetic Spectrum PowerPoint Presentation for Teachers/Students
Here are some additional examples of practical applications of different regions of the electromagnetic spectrum:
Radio waves:
- Wireless communication (WiFi, Bluetooth, mobile networks)
- Radio broadcasting
Microwaves:
- Satellite communication and television
- Cell phone networks
- Microwave ovens
Infrared:
- Infrared cameras and thermometers
- TV remote controls
- Infrared heating
Visible light:
- Lighting
- Photography
- Displays (LCD, LED screens)
Ultraviolet:
- UV lamps for curing, sterilization and counterfeit detection
- Fluorescence microscopy
- Dermatology treatments
X-rays:
-
ultraviolet radiation
This document discusses ultraviolet (UV) radiation. It defines UV as electromagnetic radiation with wavelengths between 10-400 nm that makes up about 10% of the sun's output. UV is classified into UVA, UVB, and UVC based on wavelength, with UVA having the longest wavelengths. While UVA and UVB pass through the atmosphere, UVC and some UVB are absorbed by the ozone layer. Exposure to UV can cause sunburn and premature skin aging. However, UV treatment under medical supervision can help conditions like rickets, psoriasis, eczema, and jaundice.
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APPLICATIONS OF EM WAVES.ppt
Radio waves are used for GPS, wireless communications, and medical imaging. Microwaves are used in microwave ovens, radar, and satellite communications. Infrared is used in thermal imaging, remote controls, and night vision. Visible light is what we see, while ultraviolet sterilizes water and produces vitamin D. X-rays are used for medical imaging, and gamma rays are used for cancer treatment and in nuclear weapons. All electromagnetic waves travel at the speed of light and have different wavelengths and frequencies that determine their energy and ability to penetrate matter.
Electro magnetic wave(bpp)
This document discusses electromagnetic waves and their classification according to frequency. Electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and differ in frequency and wavelength, with higher frequency waves having shorter wavelengths and higher energy. Examples are given of how each type of electromagnetic wave is used technologically and occurs naturally.
chandan radio.pptx
Electromagnetic waves are waves that can travel through space and are formed by oscillating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and are used in various medical applications such as MRI, radiation therapy, medical imaging, and sterilization.
Electromagnetic Spectrum
The document discusses the electromagnetic spectrum. It describes how white light is dispersed by a prism into visible colors from violet to red due to different wavelengths being refracted differently. It states that all electromagnetic waves travel at the speed of light in a vacuum and lists their properties. The document then discusses various applications of different parts of the electromagnetic spectrum, including uses of radio waves for communication, microwaves for satellites and radar, infrared for remote controls and intruder alarms, visible light for optical fibers, ultraviolet for sunbeds and sterilization, X-rays for medical imaging and gamma rays for cancer treatment.
UV SPECTROSCOPY ppt.pptx
This document provides an overview of UV-Visible spectroscopy. It discusses the basic principles including electromagnetic radiation, spectroscopy, absorption of UV-Visible light, and Beer-Lambert's law. It describes the instrumentation of UV-Visible spectroscopy including light sources, wavelength selectors, sample compartments, detectors and basic components. It also discusses electronic transitions, shifts in absorption, and applications of UV-Visible spectroscopy in qualitative and quantitative analysis.
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Instrumentation of uv spectrophotometer pranav kumar singh
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Electromagnetic Spectrum PowerPoint Presentation for Teachers/Students
Electromagnetic Spectrum PowerPoint Presentation for Teachers/Students
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Romania
Romania has a population of over 22 million people, with Romanians making up around 89.5% of the population. The capital and largest city is Bucharest, which has a population of over 2 million. Over 86% of Romanians belong to the Orthodox Church, and Romania celebrates its National Day on December 1st. Bucharest is undergoing modernization with a mix of old and new architecture, as it develops its economy and cultural attractions.
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Infrared radiation was discovered in the early 19th century by William Herschel. Infrared radiation is an electromagnetic radiation with a wavelength longer than visible light. Infrared radiation includes most of the thermal radiation emitted by objects near room temperature through molecular rotational and vibrational movements. Infrared light is used in various applications like infrared cameras to detect heat loss, observe blood flow, and detect overheating equipment. It also allows astronomy observations of objects obscured by interstellar dust. Night vision devices using infrared illumination allow observation without detection. The Earth absorbs visible and invisible radiation from the sun and re-emits much of the energy as infrared radiation, which is absorbed by greenhouse gases in the atmosphere and re-radiated to warm
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Ultraviolet eng
- 1. Ultraviolet radiation Macaneata Mihai Madalin Presuceanu Marian Stancu Cosmin Tomel
- 3. Ultraviolet radiations can be detected using devices like: • A photodiode is a type of photodetector capable of converting light into either current or voltage, depending upon the mode of operation. The common, traditional solar cell used to generate electric solar power is a large area photodiode.
- 4. • Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 100 million times (i.e., 160 dB), in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is very low.
- 6. • Ultraviolet radiation has wavelengths shorter then • Ultraviolet radiation has a wavelength between 200nm and 400nm. • UV type C (UVC), 100 - 280 nm. • UV type B (UVB), 280 - 315 nm. • UV type A (UVA), 315 - 400 nm. • Natural sunlight contains UV rays. Intense exposure to UV rays can affect the human body Most of the solar UV radiations are UVA.* • UVB de narrow band (311nm) and they have the lowest risk of causing cancer or solar burns.
- 7. • By wavelength: • 13.5 nm: Extreme Ultraviolet Lithography • 230-365 nm: UV-ID, label tracking, barcodes • 230-400 nm: Optical sensors, various instrumentation • 240-280 nm: Disinfection, decontamination of surfaces and water (DNA absorption has a peak at 260 nm) • 200-400 nm: Forensic analysis, drug detection • 270-360 nm: Protein analysis, DNA sequencing, drug discovery • 280-400 nm: Medical imaging of cells • 300-320 nm: Light therapy in medicine • 300-365 nm: Curing of polymers and printer inks • 300-400 nm: Solid-state lighting • 350-370 nm: Bug zappers (flies are most attracted to light at 365 nm)