A wave source of frequency v and an observer are located a fixed distance apart. Both the source and observer are stationary. However, the propagation medium (through which the waves travel at speed v ) is moving at a uniform velocity vm in an arbitrary direction. If v' is the frequency received by the observer then :

Question

A wave source of frequency v and an observer are located a fixed distance apart. Both the source and observer are stationary. However, the propagation medium (through which the waves travel at speed v ) is moving at a uniform velocity vm in an arbitrary direction. If v' is the frequency received by the observer then : (A) v' ≠ v (B) v'=v as the transit time from source to observer is the same for all wave fronts (C) v' < v as the transit time from source to observer is the same for all wave fronts (D) Data Insufficient

Tardigrade Admin · Accepted Answer

As both source and observer are at rest the number of wavefronts / oscillations reaching to observer per unit time so frequency received will be same.

$v^{'} \neq = v$

$v^{'} = v$ as the transit time from source to observer is the same for all wave fronts

$v^{'} < v$ as the transit time from source to observer is the same for all wave fronts

Data Insufficient

As both source and observer are at rest the number of wavefronts / oscillations reaching to observer per unit time so frequency received will be same.

v′=v

v′=v as the transit time from source to observer is the same for all wave fronts

v′<v as the transit time from source to observer is the same for all wave fronts

Data Insufficient

As both source and observer are at rest the number of wavefronts / oscillations reaching to observer per unit time so frequency received will be same.

$v^{'} \neq = v$

$v^{'} = v$ as the transit time from source to observer is the same for all wave fronts

$v^{'} < v$ as the transit time from source to observer is the same for all wave fronts