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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.
Related Questions: - When photons of energy hν fall on an aluminium plate (of work function E₀),
- A projectile is fired at 30°. Neglecting friction, the change in kinetic energy when
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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- A projectile is fired at 30°. Neglecting friction, the change in kinetic energy when
- Current flows in semi-conductors through
- A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions
- Light of wavelength 500 nm is incident on a metal with work function 2.28 eV.
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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