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

Explanation

(i) `E = hv`
`= (6.626 xx 10^(-34) Js) xx (3 xx 10^(15) s^(-1))`
`= 1.988 xx 10^(-18) J`
(ii) `E = hv = (hc)/(lambda)`
`=((6.626 xx 10^(-34) Js) xx (3 xx 10^(8) ms^(-1)))/((0.50 xx 10^(-10) m))`
`=3.98 xx 10^(-15) s`.