Light is:
1. | a wave phenomenon |
2. | a particle phenomenon |
3. | both particle and wave phenomenon |
4. | none of the above |
1. | \(\alpha>\beta\) |
2. | \(\beta>\alpha\) |
3. | \(\alpha=\beta\) |
4. | \(\alpha~\&~\beta \) cannot be predicted. | the relation between
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. |
The wavefronts of light coming from a distant source of unknown shape are nearly:
1. plane
2. elliptical
3. cylindrical
4. spherical
For light diverging from a point source:
(a) | the wavefront is spherical. |
(b) | the intensity decreases in proportion to the distance squared. |
(c) | the wavefront is parabolic. |
(d) | the intensity at the wavefront does not depend on the distance. |
1. | (a), (b) | 2. | (a), (c) |
3. | (b), (c) | 4. | (c), (d) |
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. \(4I_0\)