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Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air
Options
(a) decreases by a factor 10
(b) increases by a factor 20
(c) decreases by a factor 20
(d) increases by a factor 10
Correct Answer:
decreases by a factor 20
Explanation:
We have, v = nλ ⇒ v ∞ λ (as n remains constant)
Thus, as v increases 10 times, λ also increases 10 times.
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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two lenses of power 15 D and -3 D are placed in contact.
- A body rolls down a stair case of 5 steps. Each step has height 0.1 m and width 0.1m
- When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
- The self-inductance of a choke coil is 10 mH. When it is connected with a 10 V DC source,
- The first line in Lyman series has wavelength λ. The wavelength
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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