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For total internal reflection to take place, the angle of incidence i and the refractive index μ of the medium must satisfy the inequality
|
(a) |
(b) |
(c) sin i < |
(d) sin i > |
Monochromatic light is refracted from air into the glass of refractive index μ. The ratio of the wavelength of incident and refracted waves is
|
(a) 1 : μ |
(b) 1 : |
(c) μ : 1 |
(d) 1 : 1 |
The minimum wavelength of X-ray emitted by X-rays tube is 0.4125 Å. The accelerating voltage is
|
(a) 30 kV |
(b) 50 kV |
(c) 80 kV |
(d) 60 kV |
The resistivity of iron is 1
. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm - m will be
|
(a) |
(b) 2 |
(c) 4 |
(d) 8 |
1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is
|
(a) 63 |
(b) 63 |
(c) 63 |
(d) 63 |
