Questions
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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a
1.1 μ kg ms-1
b
2.2 μ kg ms-1
c
3.3 μ kg ms-1
d
4.4 μ kg ms-1
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Correct option is B
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-1Similar Questions
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a non-reflecting surface is [c is the velocity of light]
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