A sound wave propagates in air at 21°C with frequency 4.50 kHz. It passes through a region where the temperature gradually changes, and then it moves through air at 0°C. (a) What happens to the speed of the wave? The speed decreases because of the decrease in the air's density. The speed increases because of the decrease in the air's density. The speed decreases because of the increase in the air's density. The speed increases because of the increase in the air's density. The speed remains unchanged. What is the speed of the wave at 0°C? 331 ✓ m/s (b) What happens to its frequency? O The frequency increases with the decrease in temperature.
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.
![A sound wave propagates in air at 21°C with frequency 4.50 kHz. It passes through a region where the temperature gradually changes, and then it moves through air at 0°C.
(a) What happens to the speed of the wave?
The speed decreases because of the decrease in the air's density.
The speed increases because of the decrease in the air's density.
The speed decreases because of the increase in the air's density.
The speed increases because of the increase in the air's density.
The speed remains unchanged.
What is the speed of the wave at 0°C?
331
m/s
(b) What happens to its frequency?
O The frequency increases with the decrease in temperature.
O The frequency decreases with the decrease in temperature.
The frequency remains unchanged.
What is the frequency of the wave at 0°C?
3.10
X
Your response differs from the correct answer by more than 10%. Double check your calculations. kHz
(c) What happens to its wavelength?
O The wavelength increases because the wave crests are closer together.
O The wavelength decreases because the wave crests are further apart.
O The wavelength increases because the wave crests are further apart.
O The wavelength decreases because the wave crests are closer together.
O The wavelength remains unchanged.
What is the wavelength of the wave at 0°C?
0.106
x
Your response differs from the correct answer by more than 10%. Double check your calculations. m](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3f95aca6-e279-499b-bb74-3afae1a19fc6%2F7898e083-322c-4c70-a66f-e8eb4dc6cc9d%2F7udlxp_processed.jpeg&w=3840&q=75)
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