i. A giant refracting telescope has an objective lens of focal length 15 m. If an eye piece of focal length 1.0 cm is used, what is the angular magnification of the telescope?

ii. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106 m and the radius of lunar orbit is 3.8 × 108 m.

Use Kirchhoff’s rules to obtain conditions for the balance condition in a Wheatstone bridge.

Name the parts of the electromagnetic spectrum which is

(a) Suitable for radar systems used in aircraft navigation.

(b) Used to treat muscular strain.

(c) Used as a diagnostic tool in medicine.

Write in brief, how these waves can be produced.

Write Einstein’s photoelectric equation and mention which important features in photoelectric effect can be explained with the help of this equation.

The maximum kinetic energy of the photoelectrons gets doubled when the wavelength of light incident on the surface changes from l1 to l2. Derive the expressions for the threshold wavelength l0 and work function for the metal surface.

In the study of Geiger-Marsdon experiment on scattering of a-particles by a thin foil of gold, draw the trajectory of a-particles in the coulomb field of target nucleus. Explain briefly how one gets the information on the size of the nucleus from this study.

From the relation R = R0 A1/3, where R0 is constant and A is the mass number of the nucleus, show that nuclear matter density is independent of A.