Question

a source of wave produces 20 crests and 20 troughs in 0.2 sec the distance between a crest and next trough is 50 CM find the wavelength , frequency and time period of wave​

Answer 1

Answer:

Wavelength = 1 m

Frequency = 100 Hz

Time period = 0.01 s

Explanation:

20 crests and 20 troughs, i.e. , 20 complete waves.

If the source produces 20 waves in 0.2 seconds, in one second it will produce 20/0.2 waves.

=> Frequency = 100 s^-1 = 100 Hz

If the source produces 20 waves in 0.2 seconds, it will produce one wave in 0.2/20 = 0.01 s

=> Time period = 0.01 s

Wavelength is the distance between 2 consecutive crests or troughs.

=> If the distance between one crest and the next trough = 50 cm , the distance between 2 consecutive crests or troughs will be 50 + 50 = 100 cm = 1 m

=> Wavelength = 1 m