Select the quantity from column II which changes with respect to the case when observer, source and…

Question

Select the quantity from column II which changes with respect to the case when observer, source and air are stationary. Consider motion along line joining source and observer.
Column-IColumn-II(i) Source moves, observer stationary[A] Frequency of sound received by observer(ii) Sound reaches observer after reflection from fixed end[B] Speed of sound w.r.t. medium(iii) Observer moves, source stationary[C] Wave-length of wave in medium (iv) Wind blows, source and observer stationary[D] None

CGP Edu Experts · Accepted Answer

The correct answer is CHECK THE SOLUTION.. Ans.
(i) [A],[C]
(ii) [D]
(iii) [A]
(iv)[C]
Sol.
According to Doppler effect
v =  v 0
where symbol have their usual meaning. Also, when source moves towards or away from listener, frequency changes due to change in wavelength

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Column-I	Column-II
(i) Source moves, observer stationary	[A] Frequency of sound received by observer
(ii) Sound reaches observer after reflection from fixed end	[B] Speed of sound w.r.t. medium
(iii) Observer moves, source stationary	[C] Wave-length of wave in medium
(iv) Wind blows, source and observer stationary	[D] None

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