In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3,15*10^{-18}J from the radiations of 600 nm, calculate the number of photons received by the detector

Chemistry - Main Course Book I

Chapter 2. Structure of Atom




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Energy in n number of photons, all with the same wavelength of λ is:

\ \ \ \ E = n* h \nu= n * \frac{hc}{\lambda}\\\\3.15*10^{-18}=n*\frac{6.626\ *10^{-34}\ *\ 2.98*10^8}{600\ *\ 10^{-9}}\\\\ \implies\ n=9.5718*10^{16}

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