Find energy of each of the photons which
a. correspond to light of frequency `3xx10^(15) Hz`.
b. have wavelength of `0.50 Å`.

Answer

(i) `3.98 xx 10^(-15) J`
(ii) `1.98 xx 10^(-18) J`

Explanation

(i) `E = hv = (hc)/lambda`
`:. E = (6.63 xx 10^(-34) xx 3.0 xx 10^8)/(0.50 xx 10^(-20))`
`=3.98 xx 10^(-15) J`.
(ii) `E = 6.63 xx 10^(-34) Js xx 3 xx 10^(15) s^(-1)`
`= 1.98 xx 10^(-18) J`.