An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be
|
(a) λ |
(b) λ |
(c) λ |
(d) λ |
(b) λ
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A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle
|
(a) 2θ |
(b) 0° |
(c) θ |
(d) 4θ |
The voltage gain of a triode depends upon
|
(a) Filament voltage |
(b) Plate voltage |
(c) Plate resistance |
(d) Plate current |
The a-particle is the nucleus of an atom of
|
(a) Neon |
(b) Hydrogen |
(c) Helium |
(d) Deuterium |
A dry cell has an e.m.f. of 1.5 V and an internal resistance of 0.05Ω. The maximum current obtainable from this cell for a very short time interval is
|
(a) 30 A |
(b) 300 A |
(c) 3 A |
(d) 0.3 A |
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 |
If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is
|
(a) |
(b) |
(c) |
(d) 1 H |
