- An1 > n2 > n3
- Bn1 < n2 < n3
- Cn1 > n2 < n3
- Dn1 < n2 > n3
Explanation:
From electromagnetic spectrum, frequencies of $\gamma$-rays is greater than frequency of X-rays. Frequency of Xrays is greater than frequency of ultraviolet rays.
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A circular loop of radius 0.0157m carries a current of 2.0 amp. The magnetic field at the centre of the loop is (![]()
|
(a) 1.57 |
(b) 8.0 |
|
(c) 2.5 |
(d) 3.14 |
In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is
|
(a) 0.08° |
(b) 0.16° |
(c) 0.20° |
(d) 0.313° |
An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of
|
(a) Refraction |
(b) Reflection |
|
(c) Total internal reflectionn |
(d) Dispersion |
An optically active compound
|
(a) Rotates the plane polarised light |
|
(b) Changing the direction of polarised light |
|
(c) Do not allow plane polarised light to pass through |
|
(d) None of the above |
The mass of a substance liberated when a charge ‘q’ flows through an electrolyte is proportional to
|
(a) q |
(b) 1/q |
(c) |
(d) 1/ |
When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon
|
(a) The time for which light falls on the metal |
|
(b) Frequency of the incident light |
|
(c) Intensity of the incident light |
|
(d) Velocity of the incident light |