Question

What is the energy (in eV) of a gamma ray of frequency 25.0 x 1020 Hz. How many molecules could this gamma ray break apart if each molecule has a binding energy of 10 eV?

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Answer 1

Summary: using Planck's hypothesis the energy in terms of frequency is given by the planck formula E=h×frequency.  Where h is planck constant. I applied this formula to get the energy which is in joule then I convert this energy into electron volt by dividing it  by the charge on one electron. Since the binding energy of one molecule is 10 electron volt this means we need 10 electron volt energy to break a molecule. Suppose n  molecules can be break apart so energy required for this processes n×10 electron volt. Since i have find Total energy given by gamma rays. So from this value of energy of gamma rays we can get the number of molecules.