The intensities of two light waves are 9 unit and 4 unit respectively. The ratio of maximum intensity to the minimum intensity is :

9:4

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4:9

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25:1

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1:25

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Solution

The correct option is B 25:1
Intensities are 9 and 4 units
Amplitudes are 3 and 2 respectively.
At maxima amplitudes add up giving 5 units.
At minima amplitudes substract giving -1 units.
The ratio of Intensities of maxima and minima is given by 25/1

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Two coherent light waves of intensity I and 4 I are superposed. The ratio of maximum and minimum possible intensities is

\frac{49}{9}

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