An Electron and a Positron,which Are Two Massive Particles,can Annihilate

question 54

Multiple Choice

An electron and a positron,which are two massive particles,can annihilate when they come together to produce two photons,which have no mass.This pair annihilation is an example of

• A)time dilation.
• B)length contraction.
• C)the equivalence of mass and energy.
• D)the principle of relativity.
• E)none of the above.

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