NCERT Solutions for Class 9 Science Chapter 12
Important NCERT Questions
Sound
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-166
Questions No-2
How are the wavelength and frequency of a sound wave related to its speed?
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In the realm of sound waves, the relationship between wavelength, frequency, and the speed of the wave is defined by a fundamental equation:
Speed = Wavelength x Frequency
Here’s a breakdown:
– Speed of Sound Wave (v): This represents how fast a sound wave travels through a particular medium, usually measured in meters per second (m/s).
– Wavelength (lambda): It denotes the distance between two consecutive points in a sound wave that are in phase, measured in meters (m).
– Frequency (f): This refers to the number of complete oscillations or cycles per second in a sound wave, measured in hertz (Hz).
According to the equation (v = λ x f):
– Effect of Frequency: If the frequency of a sound wave increases while the wavelength remains constant, the speed of the sound wave also increases. This indicates that higher-frequency sound waves travel faster through the medium.
– Effect of Wavelength: Alternatively, if the frequency remains constant but the wavelength decreases, the speed of the sound wave also increases. A shorter wavelength with a consistent frequency leads to a higher speed.
In essence, the speed of a sound wave is directly related to both its frequency and its wavelength. Any change in one of these parameters while holding the other constant will result in a corresponding change in the speed of the sound wave through a medium.