Question

an led emits green light of wavelength λ=5511.11A⁰.,Find out all the value of Eg​

Answer 1

Answer

$\bull\sf Wavelength=\lambda=5511.11Å=5511.11\times 10^{-10}m$

$\bull\sf Energy=E=?$

We know

$\boxed{\sf E=hv}$

$\\ \sf\longmapsto E=\dfrac{hc}{\lambda}$

• h=Planck's constant
• C=Speed of light in vaccum

$\\ \sf\longmapsto E=\dfrac{6.626\times 10^{-27}Js\times 3\times 10^{8}ms^{-1}}{5511.11\times 10^{-10}m}$

$\\ \sf\longmapsto E=\dfrac{19.878\times 10^{-19}Jm}{5511.11\times 10^{-10}m}$

$\\ \sf\longmapsto E=0.003\times 10^{-9}J$

$\\ \sf\longmapsto E=3\times 10^{-6}J$

$\\ \sf\longmapsto E=3\mu J$