The frequency of light ray having the wavelength 3000Å is
Options
(a) 9×10¹³ cycle/sec (b) 10¹⁵ cycle/sec (c) 90 cycle/sec (d) 3000 cycle/sec
Correct Answer:
10¹⁵ cycle/sec
Explanation:
n = v / λ = […]
When one of the slits of Young’s experiment is covered with a transport sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be […]
The coherence of two light sources means that the light waves emitted have
Options
(a) Same frequency (b) Same intensity (c) Constant phase difference (d) Same velocity
Correct Answer:
Constant phase difference
Explanation:
Constant […]
Huygen’s principle of secondary wavelets may be used to
Options
(a) Find the velocity of light in vacuum (b) Explain the particle behaviour of light (c) Find the new position of the wave […]
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to minimum intensity is 25:1. The intensities of the sources are in the ratio
Options
(a) (25:1) (b) […]
Light propagates rectilinearly because of its
Options
(a) Frequency (b) Wavelength (c) Velocity (d) Wave nature
Correct Answer:
Wavelength
Explanation:
Wavelength of light is very small. It is of the order of 6000 Å […]
If light emitted from sodium bulb is passed through sodium vapour, then we can get from emergent light
Options
(a) One line of 5890 Å (b) One line of 5896 Å (c) Both […]
180⁰ phase difference is obtained when light ray is reflected from
Options
(a) Air to glass (b) Glass to air (c) Diamond to glass (d) Glass to water
Correct Answer:
Air to glass
What is the time taken by moon light to reach earth?
Options
(a) 8 sec (b) 10 sec (c) 9 sec (d) None of these
Correct Answer:
None of these
Explanation:
Distance between earth […]
Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
Options
(a) 4×10⁻¹¹ sec (b) 2×10⁻¹¹ sec (c) 16×10⁻¹¹ sec (d) 8×10⁻¹¹ sec
Correct Answer:
4×10⁻¹¹ […]
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