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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
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A point source emits sound equally in all directions in a non-absorbing medium.
- A stone is tied to a string of length l and whirled in a vertical circle with the other end
- Which one of the following statements is WRONG in the context of X-rays generated
- The velocity of electromagnetic radiation in a medium of permittivity ε₀
- An air core solenoid has 1000 turns and is one meter long. Its cross sectional area
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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