A proton and an α - particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ sec to make 5 revolutions, then the periodic time for the α - particle would be
|
(a) 50 μ sec |
(b) 25 μ sec |
(c) 10 μ sec |
(d) 5 μ sec |
(c) 10 μ sec
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$\frac{1}{2}$
$2$
$\frac{1}{4}$
$4.$
A condenser having a capacity 2.0 micro farad is charged to 200 volts and then the plates of the capacitor are connected to a resistance wire. The heat produced in joules will be
|
(a) 4 |
(b) 4 |
(c) 4 |
(d) 2 |
The control rod in a nuclear reactor is made of
|
(a) Uranium |
(b) Cadmium |
(c) Graphite |
(d) Plutonium |
The decay constant of a radioactive element is 1.5 
per second. Its mean life in seconds will be
|
(a) 1.5 |
(b) 4.62 |
(c) 6.67 |
(d) 10.35 |
