A wave of amplitude a has an intensity of $3.0 Wm^{–2}$.
What is the intensity of a wave of the same frequency that has an amplitude 2a?
1 )
$4.2 Wm^{–2}$
2 )
$6 Wm^{–2}$
3 )
$9 Wm^{–2}$
$12 Wm^{–2}$
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