Correct Answer: Option C

Explanation

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)

 

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