A travelling wave of amplitude 0.80 m has a frequency of 16 Hz and a wave speed of 20 ms−1 Calculate the wave number of the wave.

A travelling wave of amplitude 0.80 m has a frequency of 16 Hz and a wave speed of 20 ms−1
Calculate the wave number of the wave.
A. 3
B. 4
C. 5
D. 2

Correct Option: Answer is C
A=0.8m; f=16Hz; v=20 ms−1; k=?
v = fλ
λ =1.25m

= k= 2/πλ =2×3.142/1.25

k= 5m ( to 1 s.f)

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