13. The wavelength of the scattered photon λ' is equal to (A) λ - 2h/(mc) (B) λ + 2h/(mc) (C) λ/(1 + mcλ/h) (D) λ/(1 - mc²λ/h) (E) none of the above.

8. Consider a cube of density ρ and horizontal cross-sectional area L² with vertical height L. The cube is floating in a liquid with density ρ_L. At equilibrium a fraction L₀/L of the cube is immersed in the liquid. Now let's push down the cube a little bit and release it. What is the period of the subsequent oscillation? (A) (B)(C)(D)(E) none of the above.

13. The wavelength of the scattered photon λ' is equal to
(A) λ - 2h/(mc)
(B) λ + 2h/(mc)
(C) λ/(1 + mcλ/h)
(D) λ/(1 - mc²λ/h)
(E) none of the above.

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