- AF-electron
- BP-electron
- CS-electron
- DD-electron
Explanation:
The valence electron in an alkali metal is an s-electron.
Generally, they make up Group 1 of the periodic table.
The different examples that come under this category are lithium, potassium, and francium.
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The band gap in Germanium and silicon in eV respectively is
|
(a) 0.7, 1.1 |
(b) 1.1, 0.7 |
(c) 1.1, 0 |
(d) 0, 1.1 |
A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self inductance of coil is
|
(a) 5 H |
(b) 10 H |
(c) 11 H |
(d) 12 H |
Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e.
. If
are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct

|
(a) |
(b) |
(c) |
(d) |
The direction of the null points is on the equatorial line of a bar magnet, when the north pole of the magnet is pointing
|
(a) North |
(b) South |
(c) East |
(d) West |

Which of the following is incorrect statement regarding photon
|
(a) Photon exerts no pressure |
(b) Photon energy is hv |
|
(c) Photon rest mass is zero |
(d) None of these |
