- Electron
- Proton
- He+
- Li++
Explanation:
$|\text{F}|=|\text{qVB}|$
charge of Li++ > charge of ( He+, proton, electron)
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For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
A coil having an area
is placed in a magnetic field which changes from
to
in a interval of 2 second. The e.m.f. induced in the coil will be
|
(a) 4 V |
(b) 3 V |
(c) 1.5 V |
(d) 2 V |

Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is
|
(a) 1 : 16 |
(b) 4 : 1 |
(c) 1 : 4 |
(d) 1 : 1 |