A source of wave produces 20 crests and 20 throughs in 0.2 s. Find the frequency of the wave.

A source of wave produces 40 crests and 40 trough in 0.4 s. Find the frequency of wave.

A source of wave produces 40 crests and 40 troughs in 0.4 s. What is the frequency of the wave ?

A source of transverse wave produces 40 crests and 40 troughs in 0.4s. Find the frequency of this transverse wave.

A source of wave produces 40 crests in 0.4 s. Find the frequency of wave.

A source is producing 20 waves in 4 sec. The distance between a crest and a trough is 12 cm. Find the velocity of the wave