JAMB - Physics (2023 - No. 27)
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.
3
4
5
2
Giải thích
A=0.8m; f=16Hz; v=20 \(ms^-1\); k=?
v = fλ
λ =1.25m
= k= \(\frac{2π}{λ}\) =\(\frac{2 × 3.142}{1.25}\)
k= 5m ( to 1 s.f)