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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
- In communication with help of antenna if height is doubled then the range
- The number of photons of wavelength of 540 nm emitted per second by an electric bulb
- A battery of e.m.f. E and internal resistance r is connected to an external resistance
- In a parallel plate capacitor of capacitance C, a metal sheet is inserted
- A thin prism of angle 15⁰ made of glass of refractive index µ₁ = 1.5 is combined
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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