Wave Optics — Physics STD 12 Science — Question

A hydrogen atom in ground state absorbs 10.2eV of energy. The orbital angular momentum of the electron is increased by:

The angular momentum of electron in n^th orbit is given by

(a) nh

(b)

(c) n

(d)

The capacity of a parallel plate condenser is C. Its capacity when the separation between the plates is halved will be

(a) 4 C

(b) 2C

(c)

(d)

The refractive indices of water and glass with respect to air are 1.2 and 1.5 respectively. The refractive index of glass with respect to water is

(a) 0.6

(b) 0.8

(c) 1.25

(d) 1.75

A charge +Q is moving upwards vertically. It enters a magnetic field directed to the north. The force on the charge will be towards

(a) North

(b) South

(c) East

(d) West

A point charge is brought in an electric field. The electric field at a nearby point.

1. Will increase if the charge is positive.
2. Will decrease if the charge is negative.
3. May increase if the charge is positive.
4. May decrease if the charge is negative.

The product of resistivity and conductivity of a cylindrical conductor depends on:

When a photon stimulates the emission of another photon, the two photons have:

Which of these is a correct definition of electronic current?

Consider the following two statements A and B and identify the correct choice in the given answer

A :  The characteristic X-ray spectrum depends on the nature of the material of the target.

B :  The short wavelength limit of continuous X-ray spectrum varies inversely with the potential difference applied to the X-rays tube

(a) A is true and B is false	(b) A is false and B is true
(c) Both A  and B  are true	(d) Both A and B are false