Question

The wavelength of a wave is $4m$ and two waves per second passes through a point, then the speed of the wave is _______________

• A. $2m{s}^{-1}$
• B. $8m{s}^{-1}$
• C. $6m{s}^{-1}$
• D. $4m{s}^{-1}$

Answer 1

The correct option is B $8m{s}^{-1}$

as two waves passes from the point in one sec and the wavelength of the wave is $4m$ .

so the total distance covered in one sec by the wave is $4\times 2$ = $8m$

so the speed of the wave is $8m$ per sec.

so the answer is B.