13. A photon is directed toward a stationary particle of mass m with momentum = pêx. After the collision, the photon reflects along the same path, i.e., = -p'êx. What is p'? (A) p (B)(C)(D) p - mc (E) 0

7. Which of the following statements about superconductivity is correct? (A) All materials become superconducting below 30 K (B) The resistance of a superconductor is zero (C) Superconductivity violates the first law of thermodynamics (D) Superconductivity violates the second law of thermodynamics (E) All the above are incorrect

13. A photon is directed toward a stationary particle of mass m with momentum = pê_x. After the collision, the photon reflects along the same path, i.e., = -p'ê_x. What is p'?
(A) p
(B)
(C)
(D) p - mc
(E) 0

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