The waves are observed by a child sitting in a rowboat off shore. Which of the following properties of the waves seen by the child would be greater when the boat is moving away from the beach than the boat is stationary with respect to the beach?
I. Speed of the waves with respect to the boat.
II. Frequency at which the boat encounters successive wave crests.
III. Distance between adjacent wave crests

I only

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III only

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I and II only

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II and III only

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I, II, and III

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Solution

The correct option is C I and II only
If child is moving away from the shore then it will absorved low wavelength higher frequency and High speed also with respect to child and vice versa.
Hence correct option is C.

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