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Q: The frequency of a sound wave is 50 Hz and its wavelength is 4 meters. What is the speed of sound wave?
  • A. 200 m / s
  • B. 100 m / s
  • C. 80 m / s
  • D. 400 m / s
Correct Answer: Option A - n (Frequency) = 50 Hz λ (Wavelength = 4 m v (Speed of sound) = ? ∵ v = nλ  ∴ v = 50 × 4 v = 200 m/s.
A. n (Frequency) = 50 Hz λ (Wavelength = 4 m v (Speed of sound) = ? ∵ v = nλ  ∴ v = 50 × 4 v = 200 m/s.

Explanations:

n (Frequency) = 50 Hz λ (Wavelength = 4 m v (Speed of sound) = ? ∵ v = nλ  ∴ v = 50 × 4 v = 200 m/s.