An LED is constructed from a 
junction based on a certain semi-conducting material whose energy gap is 
. Then the wavelength of the emitted light is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The wavelength of the emitted light is
where 
is the Planck's constant, 
is the velocity of light in vacuum and 
is the energy gap.
Here,
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