Airplane passengers hate the loud noise produced by airplane engines. Like all sound waves, these noises travel at about 340 meters per second. When they reach your ear, the sound waves make your ear drum vibrate. Some airlines have started experimenting with anti-sound headphones. These headphones contain speakers that give off "anti-sound" waves. The anti-sound waves are designed to cancel out the sound waves coming from the engines. As a result, the passenger hears softer engine noise. Early testing shows that these anti-sound headphones work fairly well. Answer the following: (a)Anti-sound headphones reduce the noise level heard by the passenger primarily by taking advantage of which phenomenon (b)In air at 20° C, lower-frequency sound waves travel 340 meters per second. In air at 20° C, higher-frequency sound waves travel at what speed (c ) From the passage, we can infer that an anti-sound headphone cannot work unless it incorporates some_____?
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
Airplane passengers hate the loud noise produced by airplane engines. Like all sound waves, these noises travel at about 340 meters per second. When they reach your ear, the sound waves make your ear drum vibrate.
Some airlines have started experimenting with anti-sound headphones. These headphones contain speakers that give off "anti-sound" waves. The anti-sound waves are designed to cancel out the sound waves coming from the engines. As a result, the passenger hears softer engine noise. Early testing shows that these anti-sound headphones work fairly well.
Answer the following:
(a)Anti-sound headphones reduce the noise level heard by the passenger primarily by taking advantage of which phenomenon
(b)In air at 20° C, lower-frequency sound waves travel 340 meters per second. In air at 20° C, higher-frequency sound waves travel at what speed
(c ) From the passage, we can infer that an anti-sound headphone cannot work unless it incorporates some_____?
(d) When sound waves of wavelength 0.34 m enter your ears, what is the approximate period of oscillation of your ear drums, in seconds?
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