10. A monochromatic light (\( \lambda = 560 \) nm) is incident on a thin film with refractive index n = 1.40. How thick must the film be in order for destructive interference to occur when reflected? (A)100 nm (B)200 nm (C)150 nm (D)250 nm (E)50 nm

9. In the right figure, \( R_1 = 5\Omega \), \( R_2 = 10\Omega \), \( R_3 = 15\Omega \), \( C_1 = 5\mu F \), \( C_2 = 10\mu F \), and the ideal battery has an emf \( \varepsilon = 20V \). In steady state, the total energy stored in the two capacitors is: (A)\( 2.78\times10^{-5} \) J (B)\( 1.12\times10^{-4} \) J (C)\( 2.22\times10^{-4} \) J (D)\( 2.50\times10^{-4} \) J (E)\( 4.72\times10^{-4} \) J

10. A monochromatic light (\( \lambda = 560 \) nm) is incident on a thin film with refractive index n = 1.40. How thick must the film be in order for destructive interference to occur when reflected?
(A)100 nm
(B)200 nm
(C)150 nm
(D)250 nm
(E)50 nm

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