1.

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 :

Answer»

0.25 s
4 s
25 s
15 s

Solution :`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) .


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