If two waves of intensity I and 4 I are super impose, then the minimum and maximum intensities will be
If two waves of intensity I and 4 I are super impose, then the minimum and maximum intensities will be
A. 3I, 5I
B. 1, 9
C. I, 9I
D. I, 3I
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Correct Answer - C
`I_("max") = (sqrtI_(1) + sqrtI_(2))^(2)`
`= (sqrtI + 2sqrtI)^(2) = (3 sqrtI)^(2) = 9 I`
`I_("min") = (sqrtI_(1) - sqrtI_(2))^(2) = (sqrtI - 2sqrtI)^(2) = (-sqrtI)^(2)`
= I
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