I tricky physics question. I cannot solve it. Somebody help me.

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1

<p>Thanks for came here, really thanks.</p>

<p>The question is.
The waves are observed by a child sitting in a rowboat offshore. 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 when the boat is stationary with respect to the beach? </p>

<p>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</p>

<p>(A) I only (B) III only (C) I and II only (D) II and III only (E) I, II, and III</p>

<p>Answer is D.
Why? Why the statement 2 is true? Doppler effect?
Thanks.</p>

2

<p>The boat is moving away from the shore, while wave crests are heading toward the shore. Since they are moving toward each other, the frequency of encounters would increase.</p>

3

<p>Wave Crests? Would mind show me a picture to solve that question?
The boat encounters the wave crests? What does that mean?
Waves should like a circle around the emitter?</p>

4

<p>Or toward the emitter? If the boat toward the offshore. The frequency also increase?</p>