X-rays are produced in X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from
| (a) 0 to ∞ |
(b)  to ∞, where 
|
(c) 0 to  where
|
(d) to , where 0 < 
|
(b) to ∞, where
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The radius of a metallic sphere if its capacitance is 1/9 F, is
|
(a) |
(b) |
(c) |
(d) |
A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is
|
(a) 3.5 sec |
(b) 4.0 sec |
(c) 4.5 sec |
(d) 5.0 sec |
Which of the following is true for number of spectral lines in going form Layman series to Pfund series
|
(a) Increases |
(b) Decreases |
|
(c) Unchanged |
(d) May decreases or increases |
A study of binary stars is most helpful in
|
(a) Finding their distances |
(b) Finding their temperature |
|
(c) Finding their masses |
(d) Verifying Newton's force law of gravitation |
The radius of circular path of an electron when subjected to a perpendicular magnetic field is
|
(a) |
(b) |
(c) |
(d) |
