Question

Find energy of each of the photons which
(i) correspond to light of frequency $3\times {10}^{15}Hz$.
(ii) have wavelength of $0.50\stackrel{\circ }{A}$.

Answer 1

(i) The energy of photon is

$E=h\nu =6.626\times {10}^{-34}Js\times 3\times {10}^{15}m/s$

$=1.988\times {10}^{-18}J$

(ii) The energy of photon is

$E=\frac{hc}{\lambda }=\frac{6.626\times {10}^{-34}Js\times 3\times {10}^8}{0.50\times {10}^{-10}m}$

$=3.98\times {10}^{-15}s$