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Q: The frequency of a wave travelling at a speed of 500ms⁻ ¹ is 20Hz. It’s time period is–
  • A. 4 seconds
  • B. 25 seconds
  • C. 0.05 second
  • D. 0.04 seconds
Correct Answer: Option C - Given frequency (f) = 20 Hz Time Period (T)= 1 / frequency (f) = 1/20 = 0.05 second
C. Given frequency (f) = 20 Hz Time Period (T)= 1 / frequency (f) = 1/20 = 0.05 second

Explanations:

Given frequency (f) = 20 Hz Time Period (T)= 1 / frequency (f) = 1/20 = 0.05 second