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Suresh Sharma
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Asked: 2025-02-10T10:45:53+00:00 In:

If the velocity of sound in air is 350 m s⁻¹, a person singing a note of 250 cycles per second is producing sound waves with a wavelength of

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Poll Results

28.57%(a) 5/7 m ( 2 voters )
57.14% (b) 1.4 m ( 4 voters )
0%(c) 1.4 cm
14.29% (d) 87.5 km ( 1 voter )
Based On 7 Votes

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The correct answer is (b) 1.4 m.
The wavelength (λ) is calculated using the formula: λ = v/f
where v = 350 m/s (velocity of sound) and f = 250 Hz (frequency).
λ = 350/250 = 1.4m.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. (b) Velocity of sound v = 350 m s-¹, frequency of note v = 250 cps = 250 Hz
      ∴ Wavelength of wave λ = υ /V = 350/250 m = 1.4 m

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/

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