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

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