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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
- A man measures time period of a pendulum(T) in stationary lift. If the lift moves upwards
- In some region, gravitational field is zero. The gravitational potential
- A Gaussian surface in the cylinder of cross-section πa² and length L is immersed
- Efficiency of a Carnot engine is 50% when temperature of sink is 500K. In order
- A potentiometer wire has length 4m resistance 8Ω. The resistance that must be connected
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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