Aphoton has an energy of 5.53 × 10–17 j. what is its frequency in s–1 (h = 6.63 × 10–34 j • s)?

Given: Energy E = 5.53 X 10⁻¹⁷ J;     Velocity of light c = 2.998 x 10⁸ m/s

           Planck's constant h = 6.63 x 10⁻³⁴ J.s

Required: Frequency f = ?

Formula: E = hc/λ  and Frequency f = V/λ

               λ = (6.63 x 10⁻³⁴ J.s)(2.998 X 10⁸ m/s)/(5.53 x 10⁻¹⁷ J)

               λ = 3.59 X 10⁻⁹ m

For Frequency f = ?

               f = c/λ

               f = 2.998 x 10⁸ m/s/3.59 x 10⁻⁹m

               f = 8.35 x 10¹⁶ Hz  

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