A system consists of two photons moving in opposite directions. One photon has energy $E$ and the other has energy $4 E$. The total system's mass $M$ is
A) Zero, of course.
B) $3 E$.
C) 4E.
D) $5 E$.
E) Something else (specify).

Question

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The Answer of A system consists of two photons moving in opposite directions. One photon has energy $E$ and the other has energy $4 E$. The total system's mass $M$ is
A) Zero, of course.
B) $3 E$.
C) 4E.
D) $5 E$.
E) Something else (specify).

A System Consists of Two Photons Moving in Opposite Directions EEE

A System Consists of Two Photons Moving in Opposite Directions $E$