Electromagnetic Waves — Physics STD 12 Science — Question

Answer the following question:
In what way is diffraction from each slit related to the interference pattern in a double-slit experiment?

In which orientation, a dipole placed in a uniform electric field is in (i) stable, (ii) unstable equilibrium?

A simple pendulum is a point mass suspended by a light thread from a fixed point. The particle is displaced towards one side and then released. It makes small oscillations. Is the motion of such a simple pendulum a pure rotation? If yes, where is the axis of rotation?

When a dielectric slab is gradually inserted between the plates of an isolated parallel-plate capacitor, the energy of the system decreases. What can you conclude about the force on the slab exerted by the electric field?

Is work done by a battery always equal to the thermal energy developed in electrical circuit? What happens if a capacitor is connected in the circuit?

How is the radius of a nucleus related to its mass number?###Write the relation between radius R and mass number A of a nucleus.

Answer the following question:
An electron travelling west to east enters a chamber having a uniform electrostatic field in north to south direction. Specify the direction in which a uniform magnetic field should be set up to prevent the electron from deflecting from its straight line path.

Why cannot we use Si and Ge in fabrication of visible LEDs?

In a semiconductor the concentration of electrons is 8 × 10¹³ cm^–3 and that of holes is 5 × 10¹² cm^–3. Is it a p-type or n-type semiconductor?