- ALaser beam
- BWhite light
- CSodium light
- DMercury light
Explanation:
Monochromatic light is light made up of one single pure frequency.white light, which is light that contains all frequencies, That means the sum of red, yellow, green, blue and violet. Some light sources send out monochromatic light such as lasers beam.
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In Young's double slit experiment, if the widths of the slits are in the ratio 4 : 9, the ratio of the intensity at maxima to the intensity at minima will be
|
(a) 169 : 25 |
(b) 81 : 16 |
(c) 25 : 1 |
(d) 9 : 4 |
Light of two different frequencies whose photons have energies 1eV and 2.5eV respectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be
|
(a) 1 : 5 |
(b) 1 : 4 |
(c) 1 : 2 |
(d) 1 : 1 |
When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is
If the same wire is turned into three loops to make a circular coil, the magnetic induction at the center of this coil for the same current will be
|
(a) |
(b) 9 |
(c) 3 |
(d) 27 |
A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
|
(a) 1600 cm2 |
(b) 400 cm2 |
(c) 800 cm2 |
(d) 200 cm2 |
A charged particle of mass 5 is held stationary in space by placing it in an electric field of strength
directed vertically downwards. The charge on the particle is
|
(a) -20 |
(b) -5 |
(c) 5 |
(d) 20 |
A potential difference of 42,000 volts is used in an X-ray tube to accelerate electrons. The maximum frequency of the X–radiations produced is (1 eV = 1.6
and h = 6.63 ![]()
|
(a) |
(b) |
(c) |
(d) |