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When the wavelength of sound changes from 1 m to 1.01 m, the number of beats heard are 4. The velocity of sound is
Options
(a) 400 m/s
(b) 300 m/s
(c) 404 m/s
(d) 100 m/s
Correct Answer:
404 m/s
Explanation:
v = ʋλ ⇒ Now, v = ʋ × 1
v = 1.01 × ʋ’ Also ʋ’ = (ʋ – 4)
So, ʋ × 1 = 1.01 × (ʋ – 4)
⇒ 1.01ʋ – ʋ = 1.01 × 4
0.01ʋ = 1.01 × 4
⇒ ʋ = 404 Hz
v = ʋλ
= 404 × 1 = 404 m/s
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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5Å
- A point charge q is placed at a distance x/2 directly above the centre of a cube
- Which of the following statements is correct?
- An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
- In a circuit, L,C and R are connected in series with an alternating voltage source
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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