- 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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In case of NPN-transistors the collector current is always less than the emitter current because
|
(a) Collector side is reverse biased and emitter side is forward biased |
|
(b) After electrons are lost in the base and only remaining ones reach the collector |
|
(c) Collector side is forward biased and emitter side is reverse biased |
|
(d) Collector being reverse biased attracts less electrons |
What is the resistance of a carbon resistance which has bands of colours brown, black and brown
|
(a) 100 W |
(b) 1000 W |
(c) 10 W |
(d) 1 W |
Dispersive power depends upon
|
(a) The shape of prism |
(b) Material of prism |
|
(c) Angle of prism |
(d) Height of the prism |
Total flux produced by a source of 1 cd is
|
(a) |
(b) 8 |
(c) 4 |
(d) |
An electron microscope is superior to an optical microscope in
|
(a) Having better resolving power |
(b) Being easy to handle |
|
(c) Low cost |
(d) Quickness of observation |