What is the difference between soft and hard X-rays
|
(a) Velocity |
(b) Intensity |
(c) Frequency |
(d) Polarization |
What is the difference between soft and hard X-rays
|
(a) Velocity |
(b) Intensity |
(c) Frequency |
(d) Polarization |
(c) Frequency
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A sphere of radius 1 cm has potential of 8000 V, then energy density near its surface will be
|
(a) 64 |
(b) 8 |
(b) 8 |
(d) 2.83 |
At ordinary temperatures, the electrical conductivity of semi conductors in mho/meter is in the range
|
(a) |
(b) |
(c) |
(d) |
A cathode emits 1.8
electrons per second, when heated. When 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6
. The maximum anode current is
|
(a) 2.7 μA |
(b) 29 μA |
(c) 72 μA |
(d) 29 μA |
In intrinsic semiconductor at room temperature, number of electrons and holes are
|
(a) Unequal |
(b) Equal |
(c) Infinite |
(d) Zero |
X-rays can be used to study crystal structure, if the wavelength lies in the range
| (a) 2 Å to 0.1 Å | (b) 10 Å to 5 Å | (c) 50 Å to 10 Å | (d) 100 Å to 50 Å |