Let "M" Represent the Mass of an Electron, and "C

question 19

Multiple Choice

Let "m" represent the mass of an electron, and "c" represent the speed of light. In order to create an electron- positron pair, we must start with a photon whose energy is

• A) at least mc².
• B) at least 2mc².
• C) at least 4mc².
• D) any value greater than zero.
• E) Actually it is impossible to create such pairs from photons.

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