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PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

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An LED is made from semiconducting material having a band gap of 1.1eV. What type of radiation does the LED emit?

Answer:

Solution:

Photon energy is approximately the band gap

$λ = \frac{1240}{1.1} nm ≃ 1127 nm$

This is infrared

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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