Atoms — Physics STD 12 Science — Question

Define trans conductance of a transistor.

An atom absorbs a photon of wavelength 500nm and emits another photon of wavelength 700nm. Find the net energy absorbed by the atom in the process.

Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetons (1 bohr magneton equals 9.27 × 10^-24A-m²). The density of atoms in iron is 8.52 × 10²⁸ atoms/m³.

1. Find the maximum magnetization I in a long cylinder of iron.
2. Find the maximum magnetic field B on the axis inside the cylinder.

Explain the principle of working of a meter bridge. Draw the circuit diagram for determination of an unknown resistance using it.

X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?

The yield point of a typical solid is about 1%. Suppose you are lying horizontally and two persons are pulling your hands and two person are pulling your legs along your own length. How much will be the increase in your length if the strain is 1%? Do you think your yield point is 1% or, much less than that?

Can the entire charge of a charged object 'A' be transferred to another object 'B'? If yes then how would it be possible, if not then why?

A spy jumps from an airplane with his parachute. The spy accelerates downward for some time when the parachute opens. The acceleration is suddenly checked and the spy slowly falls on the ground. Explain the action of parachute in checking the acceleration.

Draw a graph between photoelectric current and anode potential for two light beams of different intensity and same wavelength.

12J of work has to be done against an existing electric field to take a charge of 0.01C from A to B. How much is the potential difference V_B - V_A?