Q. No.When light is refracted into a medium then,
1.
its wavelength and frequency both increase.
2.
its wavelength increases but frequency remains unchanged.
3.
its wavelength decreases but frequency remains unchanged.
4.
its wavelength and frequency both decrease.
Which of the following sources gives the best monochromatic light?
1. a candle
2. a bulb
3. a mercury tube
4. a laser
The wavefronts of light coming from a distant source of unknown shape are nearly:
1. plane
2. elliptical
3. cylindrical
4. spherical
Two sources are called coherent if they produce waves:
| 1. | of equal wavelength |
| 2. | of equal velocity |
| 3. | having same shape of wavefront |
| 4. | having a constant phase difference |
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is \(25.\) The intensities of the sources are in the ratio:
1. \(25:1\)
2. \(5:1\)
3. \(9:4\)
4. \(625:1\)
The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is \(I_0.\) If one of the slits is closed, the intensity at this point will be:
1. \(I_0\)
2. \(I_0/4\)
3. \(I_0/2\)
4. \(4I_0\)
Which of the following properties show that light is a transverse wave?
1. Reflection
2. Interference
3. Diffraction
4. Polarization
Light is:
| 1. | a wave phenomenon |
| 2. | a particle phenomenon |
| 3. | both particle and wave phenomenon |
| 4. | none of the above |
| I. | The central fringe will be white. |
| II. | Closest bright fringe to the central fringe will be a violet fringe. |
| III. | There will not be any dark fringe. |
2. I, II
3. I, III
4. I, II, III
1. \(4\)
2. \(2\)
3. \(5\)
4. \(2.5\)
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