- Aincreases
- ✓decreases
- Cremains constant
- Dnone of these
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For a given surface the Gauss's law is stated as From this we can conclude that
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(a) E is necessarily zero on the surface |
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(b) E is perpendicular to the surface at every point |
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(c) The total flux through the surface is zero |
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(d) The flux is only going out of the surface |
In the context of Doppler effect in light, the term ‘red shift’ signifies
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(a) Decrease in frequency |
(b) Increase in frequency |
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(c) Decrease in intensity |
(d) Increase in intensity |
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
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(a) 0 eV |
(b) 1 eV |
(c) 2 eV |
(d) 10 eV |
$\text{Zero.}$
$\text{Mga}$
$\text{Mga}\sin\theta$
$\frac{1}{2}\text{Mga}\sin\theta$
When light rays from the sun fall on a convex lens along a direction parallel to its axis
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(a) Focal length for all colours is the same |
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(b) Focal length for violet colour is the shortest |
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(c) Focal length for yellow colour is the longest |
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(d) Focal length for red colour is the shortest |