Infrasounds presentation
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This document discusses various types of infrasound, which are sounds lower than 20 Hz that can have physical effects on humans and animals. It describes infrasound produced by natural phenomena like volcanoes, earthquakes, and whales communicating over long distances. It also discusses infrasound generated by man-made sources like weapons, vehicles, and electrical equipment. The document notes how infrasound was intentionally used by Nazi propagandists and was accidentally produced at a Disney theater, disorienting the crowd for days.
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1. Infrasound refers to sound waves that are lower in frequency than 20 Hz, which is below the normal range of human hearing.
2. Infrasound is used to study geological formations below the earth's surface and in medical applications, and can travel long distances with little loss of energy.
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This document discusses the properties of sound including frequency, intensity, and timbre. It explains that frequency refers to the number of sound waves produced per second and is measured in Hertz. Intensity refers to the amount of energy carried by a sound and determines its loudness or softness. Timbre refers to the quality of a sound. The document also discusses the effects of sound on people, noting that loud sounds can cause hearing damage over time, and outlines some ways to prevent the negative effects of sound, such as constructing soundproof rooms and limiting noisy vehicles and industries near residential areas.
Phy flipped clas 19 Dec 2020.pptx
The human range of hearing extends from 20 Hz to 20 kHz. Children and some animals can hear higher frequencies up to 200 kHz. As humans age, their ability to hear higher frequencies decreases. Infrasonic sounds range from 0-20 Hz and are produced by animals, natural events, and man-made sources like explosions. Ultrasonic sounds are above the human hearing range from 20 kHz and up. Bats, dolphins and dogs can hear ultrasonic sounds. SONAR uses sound transmission and reception to detect objects underwater by measuring the time it takes for pings to return.
Sound
This PPt is about the topic of sound
Topic:
Reflection of Sound
Echo
Audible and Inaudible sound
Ultrasonic and Infrasonic
Soundboard
How noise effects animals.pptx
This ppt includes all the effects of human behavior on animals
The aftermath of human activities on mother nature
Infrasoundultrasound
Infrasound refers to sound waves below 20 Hz that cannot be heard by humans but can be felt, producing effects like anxiety, sorrow, or chills in some people. Infrasound can travel long distances and is produced by natural phenomena like wind, earthquakes, and volcanoes. While invisible, infrasound waves slam into living tissues and structures with force, potentially exploding matter at certain pitches. Ultrasound uses transducers to emit and receive sound waves above the human hearing range, with medical uses including sonography and Doppler imaging to examine soft tissues without invasion.
ULTRASONIC-INFRA-AUDIBLE..pdfbbbbbbbbbhh
The human ear is composed of three main parts - the outer, middle, and inner ear. The outer ear collects sound waves and channels them through the ear canal to the eardrum. The middle ear contains three small bones that transmit vibrations from the eardrum to the inner ear. The inner ear contains the cochlea, which converts sound waves into neural signals that are sent to the brain. The ear can detect sounds from 20Hz to 20,000Hz, but can become less sensitive at older ages or to detect very low or high frequencies. Other animals have evolved to hear different frequency ranges that aid survival.
Sound - Chapter 12 NCERT Science for KV Students
Complete and comprehensive study of the entire chapter with attractive pictorial representation of topic being discussed and Studied. Ideal material for students to get a gist of the entire Chapter, make projects, complete ppt slide presentation for self study and group discussion.
Sound.ppt
The document discusses the ranges of audible, infrasonic, and ultrasonic sounds for humans and other animals. It provides details on:
1) The normal human hearing range is 20 Hz to 20 kHz, while some animals and children under 5 can hear higher frequencies up to 25 kHz.
2) Infrasound refers to frequencies below 20 Hz that some large animals use to communicate. Earthquakes also produce infrasonic vibrations before main tremors.
3) Ultrasound involves frequencies above 20 kHz used by bats, dolphins and porpoises to navigate and hunt. Ultrasound has medical applications like ultrasound scanning and breaking up kidney stones. Sonar also uses ultrasound to detect
Noise pollution
original ppt credits to dr yoganand. uploading again as a part of syllabus. i dont claim any authorship
Ultrasonic and infrasonic waves for physics.pptx
This document discusses sound waves across different frequency ranges:
- Audible sound is between 20 Hz and 20,000 Hz, while infrasonic waves are below 20 Hz and ultrasonic waves are above 20,000 Hz.
- Bats use ultrasonic waves up to 100 kHz to locate food and navigate, while rhinoceroses use infrasonic waves as low as 5 Hz to communicate.
- Piezoelectric transducers produce and detect ultrasonic waves by converting electrical oscillations to mechanical vibrations. Ultrasonic waves have medical applications like ultrasound scanners and Doppler flow meters.
ch 12 sound 1.pdf
Sound is a form of energy that propagates as longitudinal waves, requiring a medium. It is produced by vibrating objects and transmitted through compression and rarefaction variations in the medium. The human ear can detect sounds between 20 Hz to 20 kHz. Ultrasound with frequencies above this range has applications like medical imaging and material cleaning, while infrasound below 20 Hz is used by some animals. Sonar also uses ultrasound for underwater object detection.
sound-170102011525.pdf
Sound is a form of energy that propagates as longitudinal waves, requiring a medium. It is produced by vibrating objects and transmitted through compression and rarefaction variations in the medium. The human ear can detect sounds between 20 Hz to 20 kHz. Ultrasound with frequencies above this range has applications like medical imaging and industrial cleaning, while infrasound below 20 Hz is used for communication by some animals. Sonar uses ultrasound for underwater detection of objects.
Physics seminar
The physics seminar covered the range of human hearing and applications of ultrasound. It discussed how the normal human hearing range is 20 Hz to 20 kHz, but children and some animals can hear higher frequencies. It then covered several medical and industrial uses of ultrasound, including ultrasonic cleaning, humidification, welding, and medical applications like detecting flaws, destroying kidney stones and cataracts, and ultrasound imaging of fetuses.
Noise pollution
Though, noise is a controllable entity of the environment, on several occasions it is found to be uncontrollable and create severe impacts on life and induce unpleasant circumstances.
Noise pollution is a public nuisance to the environment.
8.8 beyound our range of hearing
This document discusses sounds that are beyond the normal human hearing range of 20-20,000 Hz. It describes ultrasonic waves, which are above 20,000 Hz, and how they are used in medical ultrasound exams to create images of tissues and organs. Ultrasonic waves are also used to detect flaws in metal pipes. Some animals like bats and dolphins use echolocation with ultrasonic pulses to navigate and find prey. Bats emit high frequency sound pulses and can detect reflections to detect objects, while dolphins use similar techniques to locate fish and navigate underwater.
sound class ix
This document discusses ultrasound, infrasound, and their applications. Ultrasound refers to sound waves with a frequency above the human hearing range of approximately 20 kHz. Ultrasound can be used for medical imaging, detection, measurement and cleaning. Sonar uses sound propagation to navigate, communicate or detect objects underwater or in air, and can use both passive listening and active pulse emission.
Sound 2
This document discusses various topics related to sound, including reflection of sound, reverberation, range of hearing, ultrasound, sonar, working of the ear, and applications of ultrasound like echocardiography. It provides definitions and explanations of key terms. For example, it defines an echo as the same sound heard again later after reflecting off an object, and defines reverberation as the persistence of sound in an enclosed space due to repeated reflections. It also discusses how sonar works using ultrasound to detect underwater objects, and how different parts of the ear detect and transmit sound waves.
SOUND AND HEARING
Sound is a form of energy produced by vibration that travels in longitudinal waves faster through solids than liquids or gases. The human ear has external, middle, and inner portions that work together to detect sound. Sound causes the eardrum and tiny bones in the middle ear to vibrate, transmitting the vibrations to the cochlea of the inner ear which transforms them into nerve impulses sent to the brain where they are interpreted. The brain also receives information from the semicircular canals of the inner ear on balance and head position.
Sound 8th manshi and loganayki
Sound is a form of energy made by vibrations. When an object vibrates, it causes the air particles around it to move in a longitudinal wave. These particles then bump into nearby particles, transferring the vibrations until the energy runs out. Sound needs a medium, such as air, water or other matter, to travel through as it cannot travel through a vacuum. The pitch and loudness of sound depends on the frequency and amplitude of vibrations.
P. sai srikar ppt on sonar applications
Sonar uses sound waves to detect objects underwater. It works by transmitting sound pulses and measuring the time it takes for the echo to return from objects. The speed of sound in water is known, so the distance to the object can be calculated. Sonar has applications like finding depth, locating ships and submarines, and ocean surveillance. It is also used by navies but can negatively impact marine animals that use sound for navigation.
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Infrasounds presentation
- 2. Content and Topics Covered • What are Infrasound's? • The Effects of Infrasound's on humans • Infrasonic Sounds: THE DRUG • Manmade Infrasound's • Natural Infrasound's • Infrasound's in the Animal Kingdom • The Nazi and Infrasound's • Infrasound's created by mistakes
- 3. Infrasound's • Is a sound that is lower then 20 Hz (Hertz) • They are especially dangerous, due to its strong vibrations, or oscillations. • Infrasound waves hug the ground, travel for long distances without losing strength, and are unstoppable
- 4. The Effects of Infrasound's on humans • Only a small amount of amplitude is required for it to have effects on the human body • Waves of infrasound are invisible, but the crash into living tissue with great force. • Infrasound disrupts the normal functioning of the middle and inner ear, leading to nausea, imbalance, impaired equilibrium, immobilization, and disorientation. Exposure to even mild doses of infrasound can lead to illness.
- 5. Infrasonic Sounds: THE DRUG • Infrasonic vibrations, though harmful, can be pleasantly stimulating in mild levels. • The effects of brief, mild exposure can give a feeling of invigoration for hours. • Feeling the effects of high-intensity/low- frequency sound can actually become an addiction
- 6. Man Made Infrasound's • Men made infrasound’s are created from the use of atomic weapons. • The infrasound produced is a fast, strong sonic wave of reduced air pressure and can travel a great distance away from the intended target, while eating up everything in its path. • Man-made structures, such as engines, cars, buses, trains, motorcycles, and airplanes also produce a low infrasound • Faulty electrical equipment call also cause infrasound's.
- 7. Natural Infrasound's Natural explosions from volcanoes produce infrasonic waves The shock waves, affecting both earth and atmosphere, continue for hours. Known to shatter windows over 1000 miles away. •Earthquakes, pounding surf, waterfalls, calving of glacial ice, tidal waves, solar flares, solar winds, hurricanes, thunderstorms are also naturally caused infrasound's
- 8. Infrasound's in the Animal Kingdom • Certain animals use infrasound. Elephants use it to communicate at distances of up to 10 miles. • "It has been known that certain whales are able to stun their prey with powerful blasts of inaudible sounds. Whales focus these powerful blasts at large squid and other fish to paralyze and catch them. In some instances, they have been known to burst their prey apart by tonal projection alone.” John Cody’s Article on Infrasound
- 9. The Nazi and Infrasound's •Nazi propaganda engineers used infrasound •The result was a nation filled with anger and hatred.
- 10. Infrasound's created by mistakes •Walt Disney and his artists accidentally experienced infrasound on one occasion • Amplified through the theatre system. •The resulting tone, though brief in duration, produced in the entire crowd nausea that lingered for several days.