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

By a monochromatic wave, we mean

(a) A single ray	(b) A single ray of a single colour
(c) Wave having a single wavelength	(d) Many rays of a single colour

An inductor, a resistance and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance:

Electromagnetic waves are produced by:

1. A static charge.
2. A moving charge.
3. An accelerating charge.
4. Chargeless particles.

Wavelength of an electron having energy 10 keV is ....................A⁰:

Stopping potential for photoelectrons

(a) Does not depend on the frequency of the incident light

(b) Does not depend upon the nature of the cathode material

(c) Depends on both the frequency of the incident light and nature of the cathode material

(d) Depends upon the intensity of the incident light

Silver and copper voltameter are connected in parallel with a battery of e.m.f. 12 V. In 30 minutes, 1 gm of silver and 1.8 gm of copper are liberated. The power supplied by the battery is ( and

(a) 24.13 J/sec

(b) 2.413 J/sec

(c) 0.2413 J/sec

(d) 2413 J/sec

In summer, a mild wind is often found on the shore of a calm river. This is caused due to,

1. Difference in thermal conductivity of water and soil.
2. Convection currents.
3. Conduction between air and the soil.
4. Radiation from the soil.

The impurity atoms with which pure silicon may be doped to make it a p-type semiconductor are those of:

Which of the following waves have a maximum frequency?