Question

distance between crest and adjacent trough is 1.5 cm .id the frequency of the wave is 100 hz .find its wave velocity

Answer 1

Distance between Adjacent Crest and trough is called Wave length.

Wave length is represented by λ

λ/2 = 1.5 cm = 1.5 /100 = 0.015 m.

λ = 0.03

Also Given Frequency ( n) = 100 Hz .

We know that,

Wave velocity ( v ) = n λ.

So,

v = 0.03 * 100 = 3m/s .

Therefore ,Wave velocity is 3 m/s

Answer 2

heya mate your answer goes like this

Wave length means the distance between the adjacent trough

let ( y ) be the symbol of wave length

note

only in this answer

so now

y/2 = 0.15m = 0.015cm

y = 0.03

and also

we have ,

frequency of wave (n) = 100Hz

so now

wave velocity = n ×y = 100 × 0.03 = 3

therefore , we can say that wave velocity = 3m/s