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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: - The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- An electric current passes through a long straight wire
- If a magnetic substance is brought near the north or the south pole of a bar magnet
- The temperature coefficient of the resistance of a wire is 0.00125 per ⁰C.
- An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- An electric current passes through a long straight wire
- If a magnetic substance is brought near the north or the south pole of a bar magnet
- The temperature coefficient of the resistance of a wire is 0.00125 per ⁰C.
- An electric charge 10⁻³ μC is placed at the origin (0,0) of X-Y co-ordinate system.
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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