The successive crest and trough of a wave are 30cm apart.Find the wavelength and also the frequency of the wave if 10 crests and 10 troughs are produced in 2 secs.

 Dear Student ,

Wavelength is the horizontal distance between successive crests or troughs. So, the wavelength is 30 cm.
1 crest and 1 trough make 1 complete vibration. 
The number of vibrations completed in 2 sec=10
So, the number of vibrations produced in 1 sec=10/2=5 Hz
Thus, the frequency is 5Hz.

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