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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 solenoid of length l metre has self inductance L henry. If number of turns
- A glass slab consists of thin uniform layers of progressively decreasing refractive
- A light of wavelength 5000Å falls on a sensitive plate with photoelectric work
- If the value of potential in an A.C circuit is 10 V, the peak value of potential is
- The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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