Explanation:
On increasing the temperature of a semi-conductor material, the density of charge increases which apparently increases the hinderance and thus decreases their mobility.
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In X-ray experiment Ka, Kb denotes
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(a) Characteristic |
(b) Continuous wavelength |
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(c) a, b-emissions respectively |
(d) None of these |
Two coherent sources S1 and S2 are separated by a distance four times the wavelength l of the source. The sources lie along y axis whereas a detector moves along + x axis. Leaving the origin and far off points the number of points where maxima are observed is
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(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
A convex lens of power + 6D is placed in contact with a concave lens of power – 4D. What is the nature and focal length of the combination
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(a) Concave, 25 cm |
(b) Convex, 50 cm |
(c) Concave, 20 cm |
(d) Convex, 100 cm |
A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced emf E will be
(a)
|
(b)
|
(c)
|
(d)
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If two bulbs of wattage 25 and 30, each rated at 220 volts, are connected in series with a 440 volt supply, which bulb will fuse
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(a) 25 W bulb |
(b) 30 W bulb |
(c) Neither of them |
(d) Both of them |