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# Wave intensity and Energy watch

1. Since E represents Energy/unit time;

E = Watts = Power

Intensity of wave = E/m2

Since the Amplitude is doubled the Intensity increases by a factor of four.

Hence, intensity is 4E/m2

Thus, the energy reaching the area per unit time is 4E

However, the answer is 2E.

Why ?
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2. You have forgotten to take account of the fact that the question states that the surface area is smaller by a half. Half the area and you half the amount of energy received.

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