Correct relation for triode is
|
(a) |
(b) μ = |
(c) μ = |
(d) None of these |
Correct relation for triode is
|
(a) |
(b) μ = |
(c) μ = |
(d) None of these |
(a)
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If T is the half life of a radioactive material, then the fraction that would remain after a time
is
|
(a) |
(b) |
(c) |
(d) |
In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half-life of the sample
|
(a) |
(b) |
(c) |
(d) 2 |
In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11th fringe on the other side, as measured from Q. If the wavelength of the light used is 6000 , then
will be equal to
|
(a) 6 |
(b) 6.6 |
(c) 3.138 |
(d) 3.144 |
Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only
|
(a) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å |
|
(b) A continuous X-ray spectrum (Bremsstrahlung] with all wavelengths |
|
(c) The characteristic X-rays spectrum of tungsten |
|
(d) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å and the characteristic X-ray spectrum of tungsten |
The output current versus time curve of a rectifier is shown in the figure. The average value of the output current in this case is
|
(a) 0 |
(b) i0/p |
(c) 2i0/p |
(d) i0 |
A line passing through places having zero value of magnetic dip is called
|
(a) Isoclinic line |
(b) Agonic line |
(c) Isogonic line | (d) Aclinic line |
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
|
(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |