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NDA 2021 GAT · General Knowledge · Sound and Waves · medium

A tuning fork of frequency 500 Hz produces sound of wavelength 0.68 m in air. The speed of sound in air is

Single correct option

A tuning fork of frequency 500 Hz produces sound of wavelength 0.68 m in air. The speed of sound in air is
  1. A. 170 m/s
  2. B. 340 m/s
  3. C. 680 m/s
  4. D. 735 m/s
Show answer and solution

Answer: (B) 340 m/s

Speed = frequency x wavelength = 500 x 0.68 = 340 m/s. Answers like 170 m/s result from halving, and 680 m/s from forgetting to multiply by the frequency properly. This value agrees with the standard speed of sound in air at about 20 degrees Celsius.
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Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake