- Is plane.
- Is convex.
- Is concave.
- May be any spherical mirror.


Explanation:

Here initially A & B is parallel to each other after reflection by teh plane mirror A' & B' goes Parallel to each other.
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When the electron in the hydrogen atom jumps from 2nd orbit to 1st orbit, the wavelength of radiation emitted is 𝜆. When the electrons jump from 3rd orbit to 1st orbit, the wavelength of emitted radiation would be
|
(a) |
(b) |
(c) |
(d) |
If the temperature of cold junction of thermocouple is lowered, then the neutral temperature
|
(a) Increases |
(b) Approaches inversion temperature |
|
(c) Decreases |
(d) Remains the same |
Radius of first Bohr orbit is r. What is the radius of 2nd Bohr orbit?
| (a) 8r | (b) 2r | (c) 4r |
(d) 2 |
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is at point A and p at point B. Then the difference between the resultant intensities at A and B is
|
(a) 2I |
(b) 4I |
(c) 5I |
(d) 7I |

For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is
|
(a) N > Z |
(b) N = Z |
(c) N < Z |
(d) N ≥ Z |