An electron positron pair, traveling toward each other with a speed of 0 99c with respect to their center of mass, collide and annihilate according to e e Assuming that the observer is at rest with respect to the center of mass of the electron positron pair, what is the wavelength of the emitted ph...

THINK The two photons created by the annihilation of the electronpositron pair must have the same en ...

An electron-positron pair, traveling toward each other with a speed of 0.99c with respect to their center

Question:

An electron-positron pair, traveling toward each other with a speed of 0.99c with respect to their center of mass, collide and annihilate according to e- + e+ → γ + γ. Assuming that the observer is at rest with respect to the center of mass of the electron-positron pair, what is the wavelength of the emitted photons?