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Home» class 9»Science» Chapter 11: Sound

What are wavelength, frequency, time period and amplitude of a... - Science

Question

What are wavelength, frequency, time period and amplitude of a sound wave?

Answer

The definitions:

  • Wavelength (\lambda): The distance between two consecutive compressions or two consecutive rarefactions is called wavelength. Its SI unit is metre (m).

  • Frequency (\nu): The number of complete oscillations (or waves) produced per unit time is called frequency. Its SI unit is Hertz (Hz).

  • Time Period (T): The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the time period. Its SI unit is second (s).

  • Amplitude (A): The magnitude of the maximum disturbance in the medium on either side of the mean value (equilibrium position) is called amplitude. Its SI unit is metre (m).