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Physics · 2022 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsSemiconductor Diode2 marksRemembervery short answer
CBSE 2022 · Region 4 · Set 1 · Q3
Name the device which converts electrical energy into light energy. Write three advantages of the device.
Name the device which converts electrical energy into light energy. Write three advantages of the device.
Marking-scheme solution
Naming the device &
Any three Uses & $\displaystyle 1_{2}^{1}$
Light emitting diode (LED)
Advantages of LED (i) Low operational voltage and less power
(ii) Fast on-off switching capability
(iii) The bandwidth of emitted light is $\displaystyle 100 \AA$ to $\displaystyle 500 \AA$ or in other words it is nearly (but not exactly) monochromatic.
(iv) Long life and ruggedness.
(v) Fast action and no warm up time required
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CBSE Class 12 Physics past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.