試題詳解

23. An LED is constructed from a p-n junction based on a certain Ga-As-P semiconducting material whose energy gap is 1.9 eV. What is the wavelength of the emitted light? (h=6.63×10^-34 J•s, c=3.00 ×10⁸ m)
(A) 10.47 nm
(B) 16.75 nm
(C) 37.79 nm
(D) 113.37 nm
(E) 654.28 nm