Answer:
Explanation:
Wavelength of a wave is length of a complete wave. length of complete wave is length of two closest points on a wave which are having same phase . It may be distance between two consecutive crest or two troughs etc.
The length of 20 waves as per given data is 8 m .
length of one wave = 8 / 20
= 0.4 m .
wave length of sound = 0.4 m
frequency = velocity of sound / wave length
= 340 /.4
850 Hz .
