Question

Change in temperature of a medium changes
A. Frequency of sound waves
B. Aptitude of sound waves
C. Wavelength of sound waves
D. Loudness of sound waves

Answer 1

Hint: Let us know that a sound wave is a pattern of disturbance caused by sound energy travelling away from its source. Sound waves are longitudinal waves. This means that the direction of particle vibration is parallel to the direction of energy wave propagation. The atoms move back and forth when they are set in vibration. A high-pressure and low-pressure region in the medium results from this continuous back-and-forth motion.

Complete answer:
We have to know that the density of the medium in which a sound wave travels is affected by temperature, which changes the speed of sound. When the temperature of a medium increases, the speed of sound across that medium rises as well.
Because the speed of sound changes, the wavelength changes as the temperature changes. The frequency remains constant during the propagation of the wave. And we know that the speed of sound v is the product of wavelength and frequency so if the frequency remains unchanged, a change in temperature changes the wavelength of sound waves.
Thus, option C is correct.
As mentioned before, the frequency remains constant during the propagation of the wave. Thus, change in temperature does not change the frequency of sound waves.
Hence, option A is false.
Change in temperature does not change the aptitude of sound waves.
Thus, option B is false.
Change in temperature does not change the loudness of sound waves.
Thus, option D is also false.

Thus, option (C) is correct.

Note:
We must note that the sound of a guitar differs from the sound of a drum. This is due to the fact that the sound produced by various sources has distinct characteristics. The frequency, wavelength, and loudness of sound can all be used to describe it. Sound reflects in the same way as light reflects. Mechanical waves need a medium to transmit their energy from one place to another. Because sound is a mechanical wave, it can't travel in a vacuum.