The amplitude of electric field is 0.2 cm for an Intensity of 5 $W a t t m^{- 2}$ . What will be the amplitude if intensity becomes 10 $W a t t m^{- 2}$ ?

0.8 cm

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0.4 cm

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0.2 cm

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0.1 cm

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Solution

The correct option is A 0.8 cm
Intensity(I) is related to amplitude A by $I \propto A^{2}$ . Therefore, as intensity is doubled , amplitude will become 4 times. Hence, $A = 0.2 \times 4 = 0.8$ cm.

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