What is the time taken by moon light to reach earth?
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 […]
Questions
Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
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 […]
An interference pattern was made by using red light. If the red light
An interference pattern was made by using red light. If the red light is replaced by blue light, the fringes will becomes
Options
(a) Wider (b) Narrower (c) Fainter (d) Brighter
Correct Answer:
Narrower
Laser beams are used to measure long distance because
Laser beams are used to measure long distance because
Options
(a) they are monochromatic (b) they are highly polarised (c) they are coherent (d) they have high degree of parallelism
Correct Answer:
they […]
The dual nature of light is exhibited by
The dual nature of light is exhibited by
Options
(a) Photoelectric effect (b) Refraction and interference (c) Diffraction and reflection (d) Diffraction and photoelectric effect
Correct Answer:
Diffraction and photoelectric effect
Explanation:
Diffraction exhibits […]
Coherent sources are those sources for which
Coherent sources are those sources for which
Options
(a) Phase difference remains constant (b) Frequency remains constant (c) Both phase difference and frequency remain constant (d) None of these
Correct Answer:
Both phase […]
Newton postulated his corpuscular theory on the basis of
Newton postulated his corpuscular theory on the basis of
Options
(a) Newton’s Rings (b) Colours of thin films (c) Rectilinear propagation of light (d) Dispersion of white light
Correct Answer:
Rectilinear propagation of light
Two beams of light having intensities I and 4I interfere to produce a fringe pattern
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2 at a point A and π at point B. […]
In Young’s double silt experiment, 12 fringes are observed to be formed
In Young’s double silt experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to […]
In Young’s experiment, the ratio of maximum to minimum intensities of the fringe
In Young’s experiment, the ratio of maximum to minimum intensities of the fringe system is 4:1. The amplitudes of the coherent sources are in the ratio
Options
(a) (4:1) (b) (3:1) (c) (2:1) (d) […]