Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

State the reason, why Ga As is most commonly used in making of a solar cell.

What is the reason that the numbers of absorption transitions is less than the emission transition in atom?

Write the formula to determine the value of electric field intensity due to a uniformly charged thin spherical shell.

In a calorimeter, the heat given by the hot object is assumed to be equal to the heat taken by the cold object. Does it mean that heat of the two objects taken together remaina constant?

What is the value of dielectric constant of metals?

What is the parallel and crossed arrangement of polaroid?

Define the term 'electrical conductivity' of a metallic wire. Write its S.I unit.

What can be the cause of helical motion of a charged particle?

Can alternating galvanometer measure both alternating and direct currents?

A satellite revolves round the earth. Air pressure inside the satellite is maintained at 76cm of mercury. What will be the height of mercury column in a barometer tube 1m long placed in the satellite?