13. What is the momentum of the scattered particle? (A) h(1/λ − 1/λ') (B) h(1/λ + 1/λ') (C) −hc(1/λ + 1/λ') (D) hc(1/λ − 1/λ') (E) none of the above.

10. An electric dipole consists of two opposite charges, each with mass m and charge ±q (respectively), and the two charges are separated by a distance d. Under a uniform external electric field E, the electric dipole performs simple harmonic oscillation if the angle between the dipole and E is small. The period of this oscillation is (A) (B) (C) (D)(E) none of the above.

13. What is the momentum of the scattered particle?
(A) h(1/λ − 1/λ')
(B) h(1/λ + 1/λ')
(C) −hc(1/λ + 1/λ')
(D) hc(1/λ − 1/λ')
(E) none of the above.

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