calculate the frequency n wavelength in angstorms of a photon having energy equal to 2eV.

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Solution

E = hâˆ¨
E = 2 eV
= 2X 1.6X10^-19
= 3.2 X10^-19j
âˆ¨ = E/h
= 3.2 X10^-19/6.634x10^-34
= 0.48 x 10¹⁵s^-1
E = hc/Î»
= 6.634 x 10^-34 x 3 x 10⁸/Î»
Î» = 6.634 x 10^-34 x 3 x 10⁸/ 3.2 X10^-19
= 6.219 x 10^-7
= 6219 Ã…

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