Question

A sea wave strikes a rock whose two successive crests are 175 m apart. If the crests are moving at
25 m/s Find out the time in which sea wave strikes the rock again.
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Answer 1

A sea wave strikes a rock whose two successive crests are 175 m apart. If the crests are moving at 25 m/s Find out the time in which sea wave strikes the rock again.

answer : 7 sec

explanation : we know, seperation between two successive crests or two successive troughs is known as wavelength of wave.

as it is given, two successive crests are 175 m apart .

so, wavelength of sea wave , λ = 175 m

speed of wave , v = 25 m/s .

using formula, v = λ/T , where T is time period.

so, T = λ/v = 175m/25m/s = 7sec

hence, after 7sec sea wave strikes again.