Physics – Class 12 Practice Test 8

1. The Bohr model of atoms uses Einstein’s photoelectric equation.

2. If the separation between the two slits is decreased in Young’s double-slit experiment keeping the screen position fixed, what will happen to the width of the fringe?

3. Identify the conclusion of the photoelectric experiment from the following.

4. In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?

5. Identify the expression for Bragg’s law from the following.

6. If the intensity of incident radiation in a photo-cell is increased, how does the stopping potential vary?

7. The atomic number of silicon is 14. Its ground state electronic configuration is

8. What is the order of the radius of an electron orbit in a hydrogen atom?

9. An α-particle of energy 10 MeV is scattered through 180^o by a fixed uranium nucleus. Calculate the order of distance of the closest approach?

10. If an α-particle collides head-on with a nucleus, what is its impact parameter?