Question

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/s. The boat bounces up once in every –

• A. 2500 sec
• B. 75 sec
• C. 4 sec
• D. 0.25 sec

Answer 1

Answer: (C)

4 sec

Answer 2

Wavelength ® Distance between the crests

so l = 100 m , v = 25 m/sec

v = nl

or 25 = n(100) \ n =

T = = 4 sec.