Explanation:
Generally Si is a semiconductor. In p type semiconductor acceptor level lies near the valence band and each donor atom contribute one electron. p-n junction electrically neutral because total charge is zero.
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A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is
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(a) Zero |
(b) 0.5 ohm |
(c) 1.1 ohm |
(d) 5.0 ohm |
In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |
A radioactive sample has 
active atoms at t = 0. If the rate of disintegration at any time is R and the number of atoms is N, then the ratio R/N varies with time as
|
(a)
|
(b)
|
(c)
|
(d)
|
An antenna is a device
|
(a) That converts electromagnetic energy into radio frequency signal |
|
(b) That converts radio frequency signal into electromagnetic energy |
|
(c) That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa |
|
(d) None of these |
Two plane mirrors are inclined at an angle of 72° . The number of images of a point object placed between them will be
|
(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
Two identical light sources S1 and S2 emit light of same wavelength l. These light rays will exhibit interference if
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(a) Their phase differences remain constant |
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(b) Their phases are distributed randomly |
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(c) Their light intensities remain constant |
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(d) Their light intensities change randomly |
A virtual image is:
