AIIMS 2018 Physics LEDs Assertion Reason Question
Assertion : Gallium arsenide phosphide is used in red L.E.D.
Reason : Its work function lies b/w 1.65 ev.
Assertion is true, Reason is true; Reason is the correct explanation of Assertion
Assertion is true, Reason is true; Reason is not the correct explanation of Assertion
Assertion is true, Reason is false
Assertion is false, Reason is true
Correct Answer
Detailed Explanation
Option A is correct because gallium arsenide phosphide (GaAsP) has a work function of approximately 1.65 eV, which makes it suitable for use in red light-emitting diodes (LEDs) due to its ability to efficiently emit light in the red spectrum when an electric current is applied. This aligns with the assertion that GaAsP is used in red LEDs, and the reason provided accurately explains why its work function is relevant to this application.
Options B and C are incorrect because while both the assertion and reason are true, the reason does indeed serve as a correct explanation for the assertion, contradicting the claim in option B. Option D is incorrect as it states that the assertion is false, which is not the case.
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