de-Broglie hypothesis treated electrons as
|
(a) Particles |
(b) Waves |
(c) Both ‘a’ and ‘b’ |
(d) None of these |
de-Broglie hypothesis treated electrons as
|
(a) Particles |
(b) Waves |
(c) Both ‘a’ and ‘b’ |
(d) None of these |
(b) Waves
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The electric field between the two spheres of a charged spherical condenser
|
(a) Is zero |
(b) Is constant |
|
(c) Increases with distance from the centre |
(d) Decreases with distance from the centre |
The current through an ideal PN-junction shown in the following circuit diagram will be
|
(a) Zero |
(b) 1 mA | (c) 10 mA | (d) 30 mA |
Radius of first Bohr orbit is r. What is the radius of 2nd Bohr orbit?
| (a) 8r | (b) 2r | (c) 4r |
(d) 2 |
Which is the wrong statement in following sentences? A device in which P and N-type semiconductors are used is more useful then a vacuum type because
|
(a) Power is not necessary to heat the filament |
|
(b) It is more stable |
|
(c) Very less heat is produced in it |
|
(d) Its efficiency is high due to a high voltage across the junction |
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
| (a) p = 0, E = 0 | (b) p ¹ 0, E ¹ 0 | (c) p ¹ 0, E = 0 | (d) p = 0, E ¹ 0 |