two photons move away from each other,their relative speed will be
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Explanation:
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Answer:
vr=(v1+v2)/(1+v1*v2/c^2),
Explanation:
Although it is somewhat counter intuitive, the relative velocity is exactly the speed of light.
One of the core assumptions of special relativity is that no matter whatever frame of reference you are in - that is, no matter how fast you are traveling or what direction you are traveling in, light anywhere (as long as it is traveling in a vacuum) will be traveling at the same speed, which is the speed of light.
To see this from the formulas associated with special relativity (that is from the formulas derived from the fundamental principles of special relativity). The velocity addition formula for the relative velocity between two objects in general is