An LED is constructed from a pn junction based on a certain semiconducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is

Question

$2.9 \times 10^{-9}$ m

$1.6 \times 10^{-8}$ m

$6.5 \times 10^{-7}$ m

$9.1 \times 10^{-5}$ m

Solution

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