Explanation:
The current that flows from a point at the higher (positive) potential to a point at lower (negative) potential is called conventional current. The direction of motion of positive charges is taken as the direction of electric current.
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The stopping potential (
versus frequency (n) plot of a substance is shown in figure the threshold wave length is
|
(a) 5 |
(b) 6000Å |
|
(c) 5000 Å |
(d) Can not be estimated from given data |
In Young's double slit experiment, the distance between the two slits is 0.1 mm and the wavelength of light used is 4
. If the width of the fringe on the screen is 4 mm, the distance between screen and slit is
|
(a) 0.1 mm |
(b) 1 cm |
(c) 0.1 cm |
(d) 1 m |
A ray of light is incident on the surface of separation of a medium at an angle 45° and is refracted in the medium at an angle 30°. What will be the velocity of light in the medium
|
(a) 1.98 |
(b) 2.12 |
(c) 3.18 |
(d) 3.33 |
A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced
|
(a) In AD, but not in BC |
(b) In BC, but not in AD |
|
(c) Neither in AD nor in BC |
(d) In both AD and BC |
Ratio of amplitude of interfering waves is 3 : 4. Now ratio of their intensities will be
|
(a) |
(b) 49 : 1 |
(c) |
(d) None of these |
