MCQ
The SI unit of linear charge density is:
- AC/m.
- BC.
- CCm.
- DNone.
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The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which one of the following happens
| (a) Period decreases | (b) Period does not change |
| (c) Oscillations are damped | (d) Amplitude increases |
Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wave length of photo – electrons is 5420 Å. The work function of sodium is
|
(a) 4.58 eV |
(b) 2.29 eV |
(c) 1.14 eV |
(d) 0.57 eV |