13. Two slits, separated by \(d = 0.45\) mm, are illuminated with light of wavelength 560 nm. The pattern is viewed on a screen 2.5 m from the slits. What is the intensity at a point 2 mm from the central bright fringe? (Assume that \(I_0\) is the intensity to be produced by a single slit.)      (14)

9. An air-filled parallel plate capacitor is connected to a battery of voltage \(V_0\). There is charge \(Q_0\) on each plate, energy \(U_0\) stored between the plates and an electric field of \(E_0\) between the plates. The capacitor remains connected to the battery and a dielectric material with a dielectric constant of \(K\) is then placed between the plates of the capacitor. What are the new values of \(V\), \(Q\), \(U\), and \(E\)? (10)

13. Two slits, separated by \(d = 0.45\) mm, are illuminated with light of wavelength 560 nm. The pattern is viewed on a screen 2.5 m from the slits. What is the intensity at a point 2 mm from the central bright fringe? (Assume that \(I_0\) is the intensity to be produced by a single slit.) (14)

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