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15 m10.3 m21.6 minformation insufficient

Answer :

bSolution :

Let the speed of wave be v, for crossing one wave crests to the other while travelling in the same direction, the surfing speed has to be greater than speed of the wave, i.e., `vlt15 m//s`. <br> Let wavelength of wave be `lambda` m <br> while surfing in the same direction, <br> `lambda=(15-v)xx0.8` <br> while surfing in the direction opposite to the wave motion, <br> `lambda=(15+v)xx0.6` <br> `(15-v)0.8=(15+v)0.6` <br> `v=15//7 m//s=2.143 m//s` <br> so, `lambda=(15-2.143)xx0.8=10.3 m`