Question
Which of the following particles will experience maximum magnetic force circle when projected with the same velocity perpendicular to a magnetic field?
- Electron
- Proton
- He+
- Li++
Explanation:
$|\text{F}|=|\text{qVB}|$
charge of Li++ > charge of ( He+, proton, electron)
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The half-life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after
|
(a) 2400 years |
(b) 3200 years |
(c) 4800 years |
(d) 6400 years |

Serious draw back of the semiconductor device is
|
(a) They cannot be used with high voltage |
|
(b) They pollute the environment |
|
(c) They are costly |
|
(d) They do not last for long time |