Charge on α -particle is
|
(a) |
(b) 1.6 |
(c) 3.2 |
(d) 6.4 |
Charge on α -particle is
|
(a) |
(b) 1.6 |
(c) 3.2 |
(d) 6.4 |
(c) 3.2
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In the Young's double slit experiment, the spacing between two slits is 0.1 mm. If the screen is kept at a distance of 1.0 m from the slits and the wavelength of light is 5000 Å, then the fringe width is
|
(a) 1.0 cm |
(b) 1.5 cm |
(c) 0.5 cm |
(d) 2.0 cm |
Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage V
|
(a) |
(b) |
|
(c) |
(d) |
If the momentum of a photon is p, then its frequency is (Where m is the rest mass of the photon)
|
(a) |
(b) |
(c) |
(d) |
Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = – 4) w.r.t. this star is
|
(a) 10,000 times brighter |
(b) 2000 times brighter |
|
(c) 15000 times brighter |
(d) 4000 times brighter |
A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of θ° where
|
(a) θ = 49° |
(b) θ = 90° |
(c) θ = 98° |
(d) θ = 24 |