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A positron of mass m and kinetic energy egual to thrice its mass collides with an electron at rest. Two high-energy photons are created as they annihilate
each other. One photon enters a detector placed at an angle of 90° with respect to the direction of the incident electron. What is the value of 0 of the second photon? Note:
Both electron and positron have mass m.
E , P.
m
m
E.Pa
d
90°
a
b
E4, Pa
BEFORE
AFTER

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