By rocking a boat, a person produces water waves on a previouslyundisturbed lake
ID: 1663856 • Letter: B
Question
By rocking a boat, a person produces water waves on a previouslyundisturbed lake. this person observes that the boat oscillates 12times in 20 s, each oscillation producing a wave crest 5 cm abovethe undisturbed level of the lake,and that the waves reach theshore (12m away) in about 6 s. At an given instant of time, abouthow many wave crests are there between the boat and the shore?
By rocking a boat, a person produces water waves on a previouslyundisturbed lake. this person observes that the boat oscillates 12times in 20 s, each oscillation producing a wave crest 5 cm abovethe undisturbed level of the lake,and that the waves reach theshore (12m away) in about 6 s. At an given instant of time, abouthow many wave crests are there between the boat and the shore?
Explanation / Answer
By rocking a boat, a person produces water waves on apreviously undisturbed lake. this person observes that the boatoscillates 12 times in 20 s, each oscillation producing a wavecrest 5 cm above the undisturbed level of the lake,and that thewaves reach the shore (12m away) in about 6 s. At an given instantof time, about how many wave crests are there between the boat andthe shore ?v=12/6=2m/sec
n=12/20=0.6Hz
wavelength==2/0.6=3.333m
hence no of crests=12/3.333=3.6
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