Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon
|
(a) Distance between slit and source |
(b) Wavelength of light used |
|
(c) Width of the slit |
(d) Frequency of light used |
(a) Distance between slit and source
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In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H and the field F due to magnet will be
| (a) 3 | (b) 1/3 |
(c) 
|
(d) 1/
|
Assertion : A star which appears blue will be much hotter than the sun
Reason : It is based on Wien's law
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Cathode rays are produced when the pressure is of the order of
|
(a) 2 cm of Hg |
(b) 0.1 cm of Hg |
(c) 0.01 mm of Hg |
(d) 1 μm of Hg |
and 
ions are projected on the photographic plate with same velocity in a mass spectrograph. Which one will strike farthest
|
(a) |
(b) |
(c) |
(d) |
Photoelectric emission is observed from a metallic surface for frequencies 
and 
of the incident light rays (
. If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is
|
(a) |
(b) |
(c) |
(d) |
