First slide

Diodes

Question

Ga As (with a band gap=1.5eV) as an LED can emit

Easy

A

blue light
B

infrared rays
C

ultraviolet rays
D

x-rays

Solution

$W a v e l e n g t h : λ = \frac{h c}{e V} = \frac{12400}{E (i n e V)} \overset{o}{A} = \frac{12400}{1.5} = 8267 \overset{o}{A}$
$I n f r a r e d r a y s (> 7000 \overset{o}{A})$

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