Explanation:
Frequency of a light wave, as it travels from one medium to another, always remains unchanged, while wavelength decreases.
Decrease in the wavelength of light entering a medium of refractive index $\mu$, is given by,
$\lambda_\text{M}=\frac{\lambda}{\mu},$
Where $\lambda_\text{M}$ = wavelength in medium
$\lambda$ = wavelength in vacuum
$\mu$ = refractive index
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If 
and 
are the electric and magnetic field vectors of E.M. waves then the direction of propagation of E.M. wave is along the direction of
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(a) |
(b) |
(c) |
(d) None of these |
The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is 
.The average earth- sun distance is 1.5 
. The mass lost by the sun per day is (1 day = 86400 seconds)
|
(a) 4.4 |
(b) 7.6 |
(c) 3.8 |
(d) 3.8 |
Three positive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as in
|
(a)
|
(b)
|
(c)
|
(d)
|
Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is
|
(a) |
(b) |
(c) |
(d) |
A spectral line λ = 5000 Å in the light coming from a distant star is observed as a 5200 Å. What will be recession velocity of the star
|
(a) 1.15 |
(b) 1.15 |
(c) 1.15 |
(d) 1.15 km/sec |
A 50 mH coil carries a current of 2 ampere. The energy stored in joules is
|
(a) 1 |
(b) 0.1 |
(c) 0.05 |
(d) 0.5 |
