12. The phase difference between the two waves which give rise to a dark spot in a Young's double-slit experiment is (where m = integer): (A) 2πm+π/2 (B) 2πm+π/4 (C) 2πm+π/8 (D) zero (E) 2πm+π

10. In an oscillating series RLC circuit with R = 50 Ω, L = 20 mH and C = 2.0 μF, the maximum charge is stored on the capacitor at t = 0. Find the time required for the charge on the capacitor falling to 37% of its initial value. (A) 1. × 10⁻⁴ s (B) 2. × 10⁻⁴ s (C) 4. × 10⁻⁴ s (D) 6. × 10⁻⁴ s (E) 8. × 10⁻⁴ s

12. The phase difference between the two waves which give rise to a dark spot in a Young's double-slit experiment is (where m = integer):
(A) 2πm+π/2
(B) 2πm+π/4
(C) 2πm+π/8
(D) zero
(E) 2πm+π

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