If the listener and the source of sound moves along the same...

If the listener and the source of sound moves along the same direction with the same speed, then......... (A) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)<1$ (B) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)=0$ (C) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{3}}\right)=1$ (D) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)>1$

If the listener and the source of sound moves along the same direction with the same speed, then.........
(A) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)<1$
(B) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)=0$
(C) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{3}}\right)=1$
(D) $\left(\mathrm{f}_{\mathrm{L}} / \mathrm{f}_{\mathrm{s}}\right)>1$

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Key Concepts

Doppler Effect

The Doppler Effect is a phenomenon observed when there is relative motion between a wave source and an observer, leading to a change in the frequency or wavelength of the waves. For sound waves, this means that if the source and observer are moving relative to each other, the observed frequency can be either higher or lower than the emitted frequency depending on whether they are moving towards or away from each other.

Relative Motion

Relative motion refers to the movement of the source and the observer compared to each other. In the context of the Doppler Effect, it is the relative difference in their velocities that determines the shift in observed frequency. If there is no relative motion, meaning the source and observer move with the same speed and in the same direction, the observed frequency remains unchanged.

Frame of Reference in Sound Propagation

In sound propagation, the frame of reference is significant because sound travels through a medium (such as air) at a fixed speed relative to that medium, not relative to the source or observer. This means that when both the source and the listener move together in the same direction at the same speed, there is effectively no change in their relative position with respect to the medium, resulting in no Doppler shift in the frequency heard by the observer.

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