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.
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Wave intensity and Energy watch
- Thread Starter
- 01-04-2011 09:00
- 01-04-2011 09:19
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.