Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as
|
(a) f ∝ |
(b) f ∝ |
(c) f ∝ Z |
(d) f ∝ |
(b) f ∝ 
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Consider the following two statements A and B and identify the correct choice given in the answers
(A) Duddells thermo-galvanometer is suitable to measure direct current only
(B) Thermopile can measure temperature differences of the order of 
|
(a) Both A and B are true |
(b) Both A and B are false |
|
(c) A is true but B is false |
(d) A is false but B is true |
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation
| (a) The intensity increases |
| (b) The minimum wavelength increases |
| (c) The intensity decreases |
| (d) The minimum wavelength decreases |
When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
When a negative charge is taken at a height from earth's surface, then its potential energy
|
(a) Decreases |
(b) Increases |
|
(c) Remains unchanged |
(d) Will become infinity |
