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The light rays having photons of energy 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons
|
(a) 3 eV |
(b) 1.2 eV |
(c) 0.6 eV |
(d) 1.4 eV |
If the ratio of amplitude of two waves is 4 : 3, then the ratio of maximum and minimum intensity is
|
(a) 16 : 18 |
(b) 18 : 16 |
(c) 49 : 1 |
(d) 94 : 1 |
Among the two interfering monochromatic sources A and B; A is ahead of B in phase by 66°. If the observation be taken from point P, such that PB – PA = l/4. Then the phase difference between the waves from A and B reaching P is
|
(a) 156° |
(b) 140° |
(c) 136° |
(d) 126° |
A cell of e.m.f. E is connected with an external resistance R, then p.d. across cell is V. The internal resistance of cell will be
|
(a) |
(b) |
(c) |
(d) |
In the following reaction the value of ‘X’ is 
|
(a) |
(b) |
(c) |
(d) |
