Question 3 — If 20 compressions pass a - Questions at the end of the chapter - Chapter 10 - Sound Waves: Characteristics and Application (Exploration

Last updated at July 3, 2026 by

Question 3
If 20 compressions pass a point in 4 seconds, the frequency is (i) 80 Hz (ii) 5 Hz (iii) 10 Hz (iv) 0.2 Hz
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Answer: (ii) 5 Hz

  • Frequency \(=\dfrac{\text{compressions}}{\text{time}}=\dfrac{20}{4}=5\ \text{Hz}\).
Frequency from Compressions Frequency = compressions divided by time = 20 / 4 = 5 Hz. Option (ii)
Back to: 10.6.1 Wavelength, frequency and time period
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