The continuous X-rays spectrum produced by an X-ray machine at constant voltage has
| (a) A maximum wavelength | (b) A minimum wavelength |
|
(c) A single wavelength |
(d) A minimum frequency |
The continuous X-rays spectrum produced by an X-ray machine at constant voltage has
| (a) A maximum wavelength | (b) A minimum wavelength |
|
(c) A single wavelength |
(d) A minimum frequency |
(b) A minimum wavelength
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The area of each plate of a parallel plate capacitor is and the distance between the plates is 1mm. It is filled with mica of dielectric 6. The radius of the equivalent capacity of the sphere will be
|
(a) 47.7 m |
(b) 4.77 m |
(c) 477 m |
(d) None of the above |
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
|
(a) Straight line |
(b) Circle |
(c) Parabolic |
(d) Ellipse |
A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of
|
(a) Teak wood |
(b) Plastic material |
|
(c) Soft iron of high permeability |
(d) A metal of high conductivity |
Donor type impurity is found in
|
(a) Trivalent elements |
(b) Pentavalent elements |
|
(c) In both the above |
(d) None of these |
The angular dispersion produced by a prism:
A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be
|
(a) M |
(b) M/2 |
(c) M/4 |
(d) 2M |