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) Energy of photon (E) =hv
`h=6.626 xx 10^(-34)J s , v=3xx10^(15)Hz=3 xx 10^(15) s^(-1)`
` :. " "E=(6.626 xx 10^(-34)Js) xx(3xx10^(15) s^(-1))=1.986 xx10^(-18)J`
(ii) Energy of photon (E) `=hv=(hc)/(lambda)`
`h=6.626 xx10^(-34)J s , c=3 xx 10^(8) ms^(-1) `,
`lambda = 0.50 Ã… = 0.5 xx 10^(-10)m`.
`E=((6.626 xx 10^(-34)Js)xx(3xx10^(8)ms^(-1)))/((0.5 xx 10^(-10)m))=3.98 xx 10^(-15) J`.