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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 body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
- An engine pumps water continuously through a hose. Water leaves the hose
- The ratio of specific heats Cp/Cv=γ in terms of degrees of freedom (n) is given by
- If a steel wire of length l and magnetic moment M is bent into a semicircular arc,
- Two forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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