Radiation and Dual Nature of Matter — Physics STD 12 Science — Question

A ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β. The angle of deviation of the emergent ray from the direction of the incident ray(a) (α  - β)(b) 2(α- β)(c) (α – β)/2(d) (β - α)

If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be(a) 9 : 1(b) 3 : 1(c) 25 : 9(d) 16 : 25

The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then(a) X and Y have the same decay rate initially(b) X and Y decay at the same rate always(c) Y will decay at a faster rate than X(d) X will decay at a faster rate than Y

The wavelength of which colour is minimum ?

Solar energy is mainly caused due to(a) Fission of uranium present in the sun(b) Fusion of protons during synthesis of heavier elements(c) Gravitational contraction(d) Burning of hydrogen in the oxygen

A wire can sustain the weight of 20kg before breaking. If the wire is cut into two equal parts, each part can sustain a weight of.

1. 10kg
2. 20kg
3. 40kg
4. 80kg.