The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly
|
(a) 100 Å |
(b) 123 Å |
(c) 1.23 Å |
(d) 0.123 Å |
(c) 1.23 Å
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Which of the following is not an application of eddy currents
|
(a) Induction furnace |
(b) Galvanometer damping |
|
(c) Speedometer of automobiles |
(d) X-ray crystallography |
An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is
|
(a) 0.11 cm |
(b) 0.50 cm |
(c) 0.55 cm |
(d) 0.60 cm |
An object of length 6 cm is placed on the principle axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be
|
(a) 2 cm |
(b) 12 cm |
(c) 4 cm |
(d) 1.2 cm |
The resistivity of iron is 1
. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm - m will be
|
(a) |
(b) 2 |
(c) 4 |
(d) 8 |
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |
When subjected to a transverse electric field, cathode rays move
|
(a) Down the potential gradient |
(b) Up the potential gradient |
|
(c) Along a hyperbolic path |
(d) Along a circular path |
