- AArnold Sommerfeld
- BMax Born
- CErnest Rutherford
- DNiels Bohr
Explanation:
Electron revolves around the nucleus in walldefined.
orbits, like planets revolve around the sun was the brainchild of Niels Bohr.
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The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
|
(a) 4h, 9000 |
(b) 3h, 14000 |
(c) 3h, 235 |
(d) 3h, 50 |
The points resembling equal potentials are
|
(a) P and Q |
(b) S and Q |
(c) S and R |
(d) P and R |
Potassium has a bcc structure with nearest neighbour distance 4.525 Å. Its molecular weight is 39. Its density in kg/m3 is
|
(a) 900 |
(b) 494 |
(c) 602 |
(d) 802 |