Two photons are moving in opposite directions each with a velocity of light (c). Then their relative velocity is:

  1. c
  2. 2c
  3. c/2
  4. 0.9c


Two photons are moving in opposite directions each with a velocity of light (c). Then their relative velocity is:

Two photons are moving in opposite directions each with a velocity of light (c). Then their relative velocity is c.

The Special Theory of Relativity:

According to relativity, the speed of light is a universal constant. Any velocity added or subtracted to the speed of light yields velocity of light.

The special theory of relativity (1905) is based on the following two postulates:

  1. Laws of physics have the same form in all inertial reference frames moving with a constant velocity with respect to another.
  2. The speed of light has the same value for all observers in a different inertial frame of reference.

This question is about MSc Physics, Special Theory of Relativity. This is the previous year’s question about the competitive exams.


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2.Quantum Mechanics
3.Electromagnetic Theory
4.Atomic Physics
5.Nuclear Physics
6.Solid State Physics
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8.Heat and Thermodynamics
9.Mathematical Method for Physics
10.Special Theory of Relativity
11.Physical Wave Optics
12.Waves and Oscillations

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