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The frequency of a radar is 780 MHz. Aft...

The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of

A

0.25 km/s

B

0.5 km/s

C

1.0 km/s

D

2.0 km/s

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The correct Answer is:
B
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ALLEN -RACE-Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)
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  2. A string vibrates in 5 segments to a frequency of 300 Hz. The frequen...

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  3. An aluminium rod having a length 100 cm is clamped at its middle point...

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  4. A column of air at 51^(@) C and a tuning fork produce 4 beats per seco...

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  5. A uniform string resonates with a tuning fork, at a maximum tension of...

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  6. If in a stationary wave the amplitude corresponding to antinode is 4 c...

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  7. What is the phase difference between the displacement wave and pressur...

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  8. A wire of length l having tension T and radius r vibrates with fundame...

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  9. Equation of a standing wave is generally expressed as y=2Asinomegatcos...

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  10. Two vibrating strings of same material stretched under same tension an...

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  11. The wave-function for a certain standing wave on a string fixed at bot...

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  12. In a standing transerse wave on a string :

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  13. A string vibrates in 5 segments to a frequency of 480 Hz. The frequen...

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  14. A string vibrates in 5 segments to a frequency of 180 Hz. The frequen...

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  15. A wave is given by the equation y = 10 sin 2 pi (100 t - 0.02 x) + ...

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  16. In case of closed organ pipe, which harmonin the p^(th) overtone will ...

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  17. An organ pipe of length L is open at one end and closed at other end. ...

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  18. The first resonance length of a resonance tube is 40 cm and the second...

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  19. A man sitting in a moving train hears the whistle of the engine. The f...

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  20. A whistle of frequency 500 Hz tied to the end of a string of length 1....

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