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A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be
Options
(a) 520 Hz
(b) 485 Hz
(c) 540 Hz
(d) 460 Hz
Correct Answer:
485 Hz
Explanation:
Velocity of the car = 36000 m / 3600 s = 10 m/s
ʋemitted = 500 Hz, ʋsound = 330 m/s
ʋobs = ʋemitted [(ʋsound – ʋobs) / ʋsound]
Observed frequency ʋobs = 500 [(300 – 10) / 300]
⇒ ʋobs = 485 Hz
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- A 2 kg mass starts from rest on an inclined smooth surface with inclination
- Two points are located at a distance of 10 m and 15 m from the source of oscillation
- The temperature of a metal block is increased from 27⁰C to 84⁰C. The rate of radiated energy
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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