A boat at anchor is rocked by waves whse crests are 100 cm aprt and whose velocity is 25 cm/s. these waves reach the boat once every :

Options

A. 0.25 s
B. 4 s
C. 25 s
D. 15 s

Answer

B

Explanation

`lambda `= 100 cm `" " `v = 25 cm/s.
`v = (v)/(lambda) = (25)/(100) = (1)/(4)`
`therefore T = (1)/(v)` = 4 sec
Hence the correct choice is (b) .