An Electron and a Positron,both Essentially at Rest,annihilate Each Other,emitting

question 62

Multiple Choice

An electron and a positron,both essentially at rest,annihilate each other,emitting two identical photons in the process.What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10^-31 kg.(h = 6.626 × 10^-34 J ∙ s,c = 3.00 × 10⁸ m/s)

• A)1.21 × 10^-12 pm
• B)1.73 pm
• C)2.42 pm
• D)3.07 pm
• E)3.46 pm

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