Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectMedium2 minPYQ_2020

PhysicsMediumnumerical

A certain radar operates at a wavelength of $50 cm$ . If the beat frequency between the transmitted signal and the signal reflected from aircraft $∆ f = 1 kHz$ , then what will be the velocity (in $km h^{- 1}$ ) of the aircraft?

Answer:

900.00

Solution:

$∆ f = f \frac{2 v}{c} = 2 v \frac{1}{λ}$

$∴ v = λ \frac{∆ f}{2} = \frac{0.5 \times 1000}{2} = 250 m s^{- 1}$

$= 900 k m / h r$

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:Dopler's effect

⏱ 2mℹ️ Source: PYQ_2020

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