Answer to Question #303560 in General Chemistry for kasim seid

Question

. The red spectral line of lithium occurs at 671nm.calculate the energy of one photon.

Answer 1

The frequency of light can be found using c = νλ by rearranging to give ν = c/λ = (3.00 x 10⁸ m/s) ÷ (6.71 x 10^-7 m) = 4.47 x 10¹⁴/s.

The frequency of this light is

 ν = C/ λ = 3.00 x 10⁸ m/s / 6.71x 10^-7 m = 4.47 x 10¹⁴/s

Hence, the energy of one photon is

  E = hν = 6.63 x 10^-34 J.s x 4.47 x 10¹⁴/s = 2.96 x 10^-19 J