Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

What are coherent sources of light?

Can X-rays be polarized?

What is the average power given by an ac source to a capacitor?

Answer the following questions regarding earth’s magnetism:
If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?

What is the magnification in this case?

From the following, identify the electromagnetic waves having the:

1. Maximum.
2. Minimum frequency.

1. Radio waves,
2. Gamma-rays,
3. Visible light,
4. Microwaves,
5. Ultraviolet rays,
6. Infrared rays.

What is the electrostatic potential due to an electric dipole at an equatorial point?

A bar magnet falls from a height ‘h’ through a metal ring. Will its acceleration be equal to g? Give reason for your answer.

Nuclear fusion reaction is more difficult than nuclear fission. Why?

When a semiconducting material is doped with an impurity, new acceptor levels are created. In a particular thermal collision, a valence electron receives an energy equal to 2kT and just reaches one of the acceptor levels. Assuming that the energy of the electron was at the top edge of the valence band and that the temperature T is equal to 300K, find the energy of the acceptor levels above the valence band.