What is the wavelength of a photon that has the minimum energy necessary to produce an electron-positron pair?
A)1.2 pm
B)2.4 pm
C)7.6 pm
D)91 nm
E)120 nm

Question

Quizplus · Accepted Answer

The minimum energy necessary to produce an electron-positron pair is equivalent to twice the rest mass energy of an electron (or positron), which is 2 x 0.511 MeV = 1.022 MeV. Using the relationship E = hc/λ, where h is Planck's constant and c is the speed of light, and converting energy to the appropriate units, we can solve for λ (wavelength). The calculated wavelength for a photon with this energy is approximately 1.2 picometers (pm), making option A correct.

What Is the Wavelength of a Photon That Has the Minimum