Radio waves of wavelength $λ$ are sent from a RADAR towards an aeroplane. If the aeroplane is moving towards the RADAR station, the wavelength of the radiowaves received after reflection from the aeroplane will be

λ

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> λ

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< λ

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more or less than

λ

, depending on the speed of aeroplane

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Solution

The correct option is C $< λ$
As the plane is approaching the RADAR therefore by Doppler's effect , RADAR will receive an increase in frequency i.e. decrease in wavelength therefore wavelength after reflection $< λ$ .

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Radio waves of wavelength λ are sent from a RADAR towards an aeroplane. If the aeroplane is moving towards the RADAR station, the wavelength of the radiowaves received after reflection from the aeroplane will be

The correct option is C <λAs the plane is approaching the RADAR therefore by Doppler's effect , RADAR will receive an increase in frequency i.e. decrease in wavelength therefore wavelength after reflection <λ .

Radio waves of wavelength $λ$ are sent from a RADAR towards an aeroplane. If the aeroplane is moving towards the RADAR station, the wavelength of the radiowaves received after reflection from the aeroplane will be

The correct option is C $< λ$
As the plane is approaching the RADAR therefore by Doppler's effect , RADAR will receive an increase in frequency i.e. decrease in wavelength therefore wavelength after reflection $< λ$ .