The wavelength of light emitted by GaAs laser is 8670 x 10¯¹ᴼ m. I – McqOptions

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1.	The wavelength of light emitted by GaAs laser is 8670 x 10¯¹ᴼ m. If h = 6.626 x 10¯³⁴ Js, velocity of light = 3 x 10⁸ m/s and eV = 1.602 x 10¯¹⁹ J, the energy gap in GaAs is
A.	0.18 eV
B.	0.7 eV
C.	1.43 eV
D.	2.39 eV
Answer» D. 2.39 eV

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