A silicon speciman is made into a P-type semi-conductor by dopping, on an average, one Indium atom per 5 
silicon atoms. If the number density of atoms in the silicon specimen is 5 
then the number of acceptor atoms in silicon per cubic centimetre will be
|
(a) 2.5 |
(b) 1.0 |
|
(c) 1.0 |
(d) 2.5 |
(c) 1.0 
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An electron (mass = 9 × 10–31kg. Charge = 1.6 × 10–19C) whose kinetic energy is 7.2 × 10–18 joule is moving in a circular orbit in a magnetic field of 9 × 10–5 weber/m2. The radius of the orbit is
|
(a) 1.25 cm |
(b) 2.5 cm |
(c) 12.5 cm |
(d) 25.0 cm |
Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern
|
(a) Will be more clear |
(b) Will contract |
|
(c) Will expanded |
(d) Will not be visualized |
If two bulbs of wattage 25 and 100 respectively each rated at 220 volt are connected in series with the supply of 440 volt, then which bulbs will fuse
|
(a) 100 watt bulb |
(b) 25 watt bulb |
(c) None of them |
(d) Both of them |
The central point of a spherical mirror is called:
