Chapter 11

NCERT
Class 9
Science
Solutions
1. What are wavelength, frequency, time period and amplitude of a sound wave?

Question:

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

Answer:

Wavelength: The distance between two consecutive compressions (C) or consecutive rarefaction (R) is called wavelength. Alternatively, the distance travelled by a wave in one complete oscillation is called wavelength.

Frequency: The total number of oscillations that occur in unit time is called frequency. The S.E. unit of frequency in hertz which is represented by the symbol Hz.

Time period: The time taken by a wave to complete one complete oscillation of the density of the medium is called time period (T). In other words, the time taken by two consecutive compression or consecutive rarefactions to pass through a fixed point is called the time period of the wave it’s S.I. unit is second (s).

Amplitude: The maximum displacement (or disturbance) of the particles of the medium on either side of the mean position in propagation of a wave is called amplitude. It is denoted by the symbol “A”. It’s unit is meter. The loudness or softness of sound is determined by it’s amplitude.

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