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Asked in PMC Practice Test 16 (2021) 2021

Wavelength of sound in air is 10 cm, what is the frequency of the sound wave?

Correct answer: C. 3300 Hz

  • A. 33 Hz
  • B. 330 Hz
  • C. 3300 Hz
  • D. 33000 Hz

Explanation

Speed of sound in air = 330m/s Wavelength = 10 cm = 0.1 m Frequency = speed of sound / wavelength Frequency = 330/0.1 = 3300 Hz Thus mathematically option A,C&D are incorrect

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About Wave Speed

Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.

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