A Hypothetical Particle Has a Mass Of $510 \mathrm { MeV } / \mathrm { c } ^ { 2 }$

Short Answer

A hypothetical particle has a mass of $510 \mathrm { MeV } / \mathrm { c } ^ { 2 }$ . If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , c = \right.$ $\left. 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$