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Which one of the following does not fit into the group?

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Photon

Graviton

Proton

Meson

answer is C.

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Detailed Solution

Photons are exchange particles for electromagnetic interactions.

Gravitons are exchange particles for gravitational interactions.

Mesons are exchange particles for nuclear interactions.

Whereas protons are not any sort of exchange particles and hence do not fit in a group with other three particles.

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