An electron (m=9.11 * 10^-31 kg)interacts with a positron and a single photon is emitted.Find the smallest possible frequency for this photon. A)8.2 * 10¹¹ Hz B)6.8 * 10¹⁸ Hz C)1.3 * 10²⁰ Hz D)2.5 * 10²⁰ Hz E)This reaction cannot occur because of conservation laws.

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Quizplus · Accepted Answer

The reaction cannot occur because it violates the conservation of energy and momentum. An electron and a positron annihilating must produce at least two photons to conserve both energy and momentum.

An Electron (M=9