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AP EAMCET202421 May 2024Morning ShiftPhysicsDual Nature of MatterActual

A blue lamp emits light of mean wavelength 4500 Å . The lamp is rated at 150 W and 8 % efficiency. Then the number of photons are emitted by the lamp per second

Options

  1. A27.17 10¹⁸
  2. B17.17 10¹⁸
  3. C27.17 10¹⁵
  4. D54 10¹⁶

Correct answer

A. 27.17 10¹⁸

Step-by-step solution

=4500 ~A ^ , P =150 ~W , =8 % Efficiency of the lamp, = Energy of photon Rated energy of lamp = ( nhc ) p . t Number of photons emitted per second. aligned & n t = p . . hc = 150 4500 8 100 1240 1.6 10⁻¹⁹ & =27.17 10¹⁸ aligned

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