An Electron-Positron Pair Traveling Towards Each Other with a Speed $\rarr$

question 18

Multiple Choice

An electron-positron pair traveling towards each other with a speed of 0.95 c with respect to their center of mass,collide and annihilate according to e^- + e⁺ $\rarr$ $\gamma$ + $\gamma$ .Assuming the observer is at rest with respect to the center of mass of the electron-positron pair,what is the frequency of the photons?

• A)9.89 * 10¹⁹ Hz
• B)9.02 * 10¹⁸ Hz
• C)5.13 * 10²⁰ Hz
• D)7.25 * 10¹⁹ Hz
• E)3.95 * 10²⁰ Hz

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