Question

calculate the energy of photon its wave length​

Answer 1

Answer:-

• Wavelength=$\lambda$=200Å

Finding frequency:-

We know that

$\boxed{\sf \lambda=\dfrac{c}{v}}$

$\\ \sf\longmapsto 200\times 10^{-10}=\dfrac{3\times 10^8}{v}$

$\\ \sf\longmapsto v=\dfrac{3\times 10^8}{200\times 10^{-10}}$

$\\ \sf\longmapsto v=0.015\times 10^18$

$\\ \sf\longmapsto v=1.5\times 10^16s^{-1}$

According to planks constant

$\boxed{\sf E=hv}$

$\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 1.5\times 10^{16}s^{-1}$

$\\ \sf\longmapsto E=9.93\times 10^{-18}J$

$\\ \underline{\boxed{\bf{\therefore Energy\:of\:photon=9.93\times 10^{-18}J}}}$