- ABand emission spectrum
- BLine absorption spectrum
- CContinuous emission spectrum
- DContinuous absorption spectrum
Explanation:
Dark/ Bright light seen in an otherwise uniform and continous spectrum is a spectral line, this is due to emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
Spectrum of sunlight is an example for line absorption spectrum.
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The count rate of a Geiger- Muller counter for the radiation of a radioactive material of half life of 30 minutes decreases to 5
after 2 hours. The initial count rate was
|
(a) 25 |
(b) 80 |
(c) 625 |
(d) 20 |
Two coherent sources have intensity in the ratio of . Ratio of (intensity) max/(intensity) min is
|
(a) |
(b) |
(c) |
(d) |
The neutron was discovered by
|
(a) Marie Curie |
(b) Pierre Curie |
(c) James Chadwick |
(d) Rutherford |
X-rays region lies between
| (a) Short radiowave and visible region | (b) Visible and ultraviolet region |
| (c) Gamma rays and ultraviolet region | (d) Short radiowave and long radiowave |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass
and charge
enters in it with a velocity
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |