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Which of the following statements are true:
1. LEDs fabricated from GaAs emit radiation in the ultraviolet region.
2. LEDs fabricated from GaAs emit radiation in the infra red region.
3. When a semiconductor is doped with pentavalent impurity, the resulting material is p-type.
4. A n-type semiconductor is electrically neutral.
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- 1 and 2 only
- 3 and 4 only
- 2 and 3 only
- 1, 2, 3 and 4
Correct Option: A
NA
