An LED is constructed from a 
junction diode using GaAsP. The energy gap is 1.9 eV. The wavelength of the light emitted will be equal to [NEET 2019]
A
B
654 nm
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
The energy of light of wavelength 
is given by
…… .(i)
Here, 
Planck's constant
Substituting the given values in Eq. (i), we get
Thus, the wavelength of light emitted from LED will be 654 nm.
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