- APolarisation.
- BDiffraction.
- CPhotocurrent.
- DInterference.
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The wavelength of the most energetic X–ray emitted when a metal target is bombarded by 100 KeV electrons is approximately
| (a) 12 Å | (b) 4 Å |
(c) 0.31 Å |
(d) 0.124 Å |
The stopping potential (
|
(a) Depends upon the angle of incident light |
|
(b) Depends upon the intensity of incident light |
|
(c) Depends upon the surface nature of the substance |
|
(d) Is independent of the intensity of the incident light |
The plate current in a triode is given by where Ip, Vp and Vg are the values of plate current, plate voltage and grid voltage, respectively. What are the triode parameters m, rp and gm for the operating point at
and
?
|
(a) 10, 16.7 kW, 0.6 m mho |
(b) 15, 16.7 kW, 0.06 m mho |
|
(c) 20, 6 kW, 16.7 m mho |
(d) None of these |
Electric charges of +10μC, + 5μC, -3μC and +8 μC are placed at the corners of a square of side m. the potential at the centre of the square is
|
(a) 1.8 V |
(b) |
(c) 1.8 |
(d) 1.8 |