Braking Radiation

Q. An electric dipole of dipole moment p is lying along uniform electric field E.work done in rotating the dipole by 90 degree is

Q. A car of mass m has an engine which can deliver power p. The minimum timein which car can be accelerated from rest to a speed v is

Q. An electron passing near a positively charged nucleus should get accelerated due to the attractive force, and it's speed should increase. But the opposite is observed! It's found to get slowed down. Why do you think?

1. The electron's kinetic energy is converted into electrostatic potential energy
2. The electron loses a lot of energy in radiation when its accelerated by the nucleus, resulting in a decrease in kinetic energy
3. Law of conservation of energy doesn't apply to sub-atomic particles.

Q. Suppose the magnitude of Nuclear force between two protons varies with the distance between them as shown in figure. Estimate the ratio "Nuclear force/Coulomb force" for
(a) x = 8 fm
(b) x = 4 fm
(c) x = 2 fm
(d) x = 1 fm (1 fm = 10 ⁻¹⁵m).
Figure

Q. 6.If deutron is accelerated from rest through a potential difference of 10 kilovolt (kv). Find its final speed?

Q.

Statement I : On increasing the current in the circuit, the maximum speed with which electrons reach the anode does not change.

Statement II : The accelerating potential between the anode and the cathode is independent of the filament circuit.

1. Both the statements are correct and statement II infers to Statement I

2. Both the statements are correct but statement II does not infer to statement I

3. Both the statements are incorrect

4. Statement I is correct but Statement II is incorrect

Q.

An alpha particle is accelerated through a potential difference of 10⁶ volt. Its kinetic energy will be

(a) 1 MeV (b) 2 MeV (c) 4 MeV (d) 8 MeV

Q. If a Coolidge tube operators at 20kV, what is the maximum kinetic energy you'll find among the electrons near the target?

1. 20eV
2. 200eV
3. 2, 000 eV
4. 20, 000eV