A) \[\lambda \]
B) more than\[\lambda \]
C) less than \[\lambda \]
D) depends on speed of aeroplane
Correct Answer: C
Solution :
Dopplers effect gives the apparent change in the frequency of the soruce due to a relative motion between the source and observer. The perceived frequency is given by \[f=f\left( \frac{v\pm {{v}_{o}}}{v\pm {{v}_{s}}} \right)\]where\[{{v}_{o}}\]is speed of observer and v, speed of source. In the given case since, source is stationary (radar station),\[{{v}_{s}}=0,\]hence, frequency increases, therefore, wavelength decreases.\[(f\lambda =c)\].
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