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AP EAMCET201920 Apr 2019Evening ShiftPhysicsDual Nature of MatterActual

A lamp delivers a luminous flux of 100 ~W to an absorber of area l cm ^2 . The force due to radiation pressure is

Options

  1. A3.3 10⁻⁴ ~N
  2. B16.5 10⁻⁷ ~N
  3. C3.3 10⁻⁶ ~N
  4. D3.3 10⁻⁷ ~N

Correct answer

D. 3.3 10⁻⁷ ~N

Step-by-step solution

Force = Rate of change of linear momentum F= d p d t = d d t ( v c )= 1 c d v d t where, v= electromagnetic wave energy. aligned & F= I c = 100 3 10^8 =33.3 10⁻⁸ ~N & F=3.3 10⁻⁷ ~N aligned [( I=100 watt, given ]

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