A plane wave of amplitude A is incident on a surface of area S placed so that it is perpendicular to the direction of travel of the wave. The energy per unit time reaching the surface is E.
The amplitude of the wave is increased to 2A and the area of the surface is reduced to $\frac{1}{2}$ S.
How much energy per unit time reaches this smaller surface?
1 )
4E
2E
3 )
E
4 )
$\frac{1}{2}$E
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