A photon and an electron, each of 20 eV energy, move in free space. The ratio of linear momentum of electron p e to that of photon p ph , p e p ph , is: [Take speed of light =3 10 8 ms -1 , charge of electron =-1.6 10 -19 C and mass of electron =9 10 -31 kg]

1. A. 2 450
2. B. 1 250
3. C. 225
4. D. 275

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