- AContinuous
- ✓Line spectrum
- CSpectrum of black lines
- DSpectrum of black bonds
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A element used for radioactive carbon dating for more than 5600 years is
|
(a) C - 14 |
(b) U - 234 |
(c) U - 238 |
(d) Po - 94 |
What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit
| (a) 27 : 25 | (b) 20 : 27 |
(c) 20 : 25 |
(d) 25 : 27 |
Retina of eye acts like ........ of camera
|
(a) Shutter |
(b) Film |
(c) Lens |
(d) None of these |
The half life of
is 8 days. Given a sample of
at time t = 0, we can assert that
|
(a) No nucleus will decay before t = 4 days |
|
(b) No nucleus will decay before t = 8 days |
|
(c) All nuclei will decay before t = 16 days |
|
(d) A given nucleus may decay at any time after t = 0 |