When the source of sound moves away from a stationary listener, there is an apparent
Correct answer: C. Decrease in the frequency of sound.
- A. Increase in the pitch of sound.
- B. Increase in the amplitude of sound.
- C. Decrease in the frequency of sound.
- D. Decrease in the wavelength of sound.
Explanation
The correct answer is that there is a decrease in the frequency of sound when the source moves away from a stationary listener. This phenomenon is explained by the Doppler Effect. As the source moves away, the sound waves are stretched, leading to a lower frequency and thus a lower pitch. This is why the correct option is 'decrease in the frequency of sound.'Option A is incorrect because the pitch, which is directly related to frequency, decreases rather than increases. Option B is incorrect because amplitude is related to loudness, not frequency or pitch, and is not affected by the movement. Option D is incorrect because if the frequency decreases, the wavelength increases, not decreases.
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About Speed of Sound
The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
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