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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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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The potential energy of particle in a force field is U = A/r² – b/r, where A and B
- Let A = i Acosθ +j B sinθ be any vector.Another vector B which is normal to A is
- In a transistor the collector current is always less than the emitter current
- A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹.
- A body of weight W newton is at the surface of the earth.
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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