MCQ
How many types of electron emissions exist?
- A2
- B3
- C4
- D1
Explanation:
There are four types of electron emissions, namely, thermionic emission, photoelectric emission, secondary emission, and field emission. These are the different methods of producing electron emissions.
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Which one is correct relation for thermionic emission
|
(a) |
(b) |
(c) |
(d) |
Which one is in forward bias
|
(a)
|
(b)
|
(c)
|
(d) None of these |
The effective resistance between points P and Q of the electrical circuit shown in the figure is
|
(a) 2Rr/(R + r) |
(b) 8R(R + r)/(3R + r) |
(c) 2r + 4R |
(d) 5R/2 + 2r |
An electron is accelerated through a potential difference of 1000 volts. Its velocity is nearly
|
(a) 3.8 |
(b) 1.9 |
(c) 1.9 |
(d) 5.7 |