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Concepts Of Physics MCQ Edition [Volume 2]PhysicsBohr's Model and Physics of the Atom

Within a laser tube, every photon

Options

  1. Atravels in the same direction
  2. Btravels at the same speed
  3. Cpossesses the same energy
  4. Dpossesses the same wavelength

Correct answer

B. travels at the same speed

Step-by-step solution

Within a laser tube, both spontaneous and stimulated emissions occur. Spontaneous emission produces photons in random directions with a slight spread in energy and wavelength due to natural and Doppler broadening mechanisms. Stimulated emission produces photons that travel in the same direction with the same energy and wavelength as the incident photons. Because spontaneous emission photons are also present within the tube, not every photon travels in the same direction, nor do they all possess the exact same energ

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