Nuclei — Physics STD 12 Science — Question

Does the stopping potential in photoelectric emission depend upon,

1. The intensity of the incident radiation in a photocell?
2. The frequency of the incident radiation?

The work function of a substance depends on which factor?

Define work function for a given metallic surface.

Answer carefully:
A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point?

How much is the diameter of hydrogen atom?

Answer the following questions, which help you understand the difference between Thomson’s model and Rutherford’s model better.
Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?

The plates of a parallel-plate capacitor are given equal positive charges. What will be the potential difference between the plates? What will be the charges on the facing surfaces and on the outer surfaces?

Should the internal energy of a system necessarily increase if its temperature is increased?

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?