Light with energy flux of 24 Wm–2 is incident on a well polished disc of radius 3.5 cm for one hour. The momentum transferred to the disc is

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1.1 μ kg ms-1

2.2 μ kg ms-1

3.3 μ kg ms-1

4.4 μ kg ms-1

answer is B.

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Detailed Solution

Total energy incidentU = flux × Area × time =24 x π3.5 x 10-22 x 60 x 60 =332.34p=2UC =2 x 332.343 x 108 =2.2 x 10-6 kg ms-1 =2.2 μ kg ms-1

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