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A positron is an antiparticle of electron. A photon is a particle of light, which has no charge but non-zero energy, momentum proportional to the light frequency. If an electron and positron moving towards each other with equal and opposite velocities. Then they

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Can annihilate into one photon without conserving both energy and momentum

Cannot annihilate into one photon because momentum cannot be conserved

Can annihilate into one photon conserving both energy and momentum

Cannot annihilate into one photon because energy cannot be conserved

answer is D.

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Detailed Solution

The total momentum of electron positron pair is zero, but photon is stated to have non- zero momentum. Contradicting the law of conservation of momentum.

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