Q. No.Light is:
| 1. | a wave phenomenon |
| 2. | a particle phenomenon |
| 3. | both particle and wave phenomenon |
| 4. | none of the above |
Which of the following properties show that light is a transverse wave?
1. reflection
2. interference
3. diffraction
4. polarization
| 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. |
When light is refracted, which of the following does not change?
1. wavelength
2. frequency
3. velocity
4. amplitude
The amplitude modulated (AM) radio wave bends appreciably round the corners of a 1m × 1m board but the frequency modulated (FM) wave only negligibly bends. If the average wavelengths of AM and FM waves are \(\lambda_a\) and \(\lambda_f\),
1. \(\lambda_a\) > \(\lambda_f\)
2. \(\lambda_a\) = \(\lambda_f\)
3. \(\lambda_a\) < \(\lambda_f\)
4. we don't have sufficient information to decide about the relation of \(\lambda_a\) and \(\lambda_f\)
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 a light wave travelling in vacuum are given by \(x+y+z=c\). The angle made by the direction of propagation of light with the X-axis is:
1. \(0^{\circ}\)
2. \(45^{\circ}\)
3. \(90^{\circ}\)
4. \(\mathrm{cos^{-1}\left(\frac{1}{\sqrt{3}}\right )}\)
The wavefronts of light coming from a distant source of unknown shape are nearly:
1. plane
2. elliptical
3. cylindrical
4. spherical
The inverse square law of intensity (i.e., the intensity \(\propto \frac{1}{r^2}\)) is valid for:
1. a point source
2. a line source
3. a plane source
4. a cylindrical source
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 |
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