In a future hydrogen-fuel economy, the cheapest source of

Solution 69P

Here we have to calculate the frequency, wavelength, and minimum energy of a photon that can free an H atom from water.

Step 1

1 mol of H = 467 kJ (energy i.e E)

It is known that E = h

                =

Here E is the energy = 467 kJ

         h is the planck’s constant = 6.626 10-34 J.s

         is the frequency

Now substituting the values, frequency can be calculated as,

 =

        = = 1.17 1015 s-1

Thus the frequency of photon is found to be 1.17 1015 s-1.