Recall the formula: [tex]E=hf[/tex] [tex]E=energy\\h= 6.606 (10^{-34})J.s. \\f=frequency[/tex] Note: h is Planck's constant
Substitute all of the given values. [tex]E=hf\\1.31(10^{-22})J= 6.606(10^{-34})J.s. (f)\\f=\frac{1.31(10^{-22})J}{6.606(10^{-34})J.s.} \\f=1.98(10^{11})Hz[/tex]
To find its wavelength, we use: c=λf c= speed of light [tex]3(10^8)m/s[/tex] λ= wavelength f= frequency
Substitute all of the given values. c=λf [tex]3(10^8)m/s[/tex]=λ × [tex]1.98(10^{11})Hz[/tex] λ =[tex]\frac{3(10^8)m/s}{1.98(10^{11})Hz}[/tex] λ=[tex]6.6(10^2)m[/tex]
