A) one-third
B) doubled
C) halved
D) unchanged
Correct Answer: D
Solution :
The apparent frequency heard. When the source is moving away from the observer is: \[{{n}_{0}}=\frac{\upsilon }{\upsilon +{{\upsilon }_{s}}}{{n}_{s}}=\frac{\upsilon }{\upsilon +c}{{n}_{s}}\approx \]very very less = negligible (since \[\upsilon n,<<c\])
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