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Photons of wavelength lambda are made in...

Photons of wavelength `lambda` are made incident on sample of diatomic gas `X_(2)`. If bond energy of `X-X` bond is `EkJ mol^(-1)`:
(a) Find critical value of `'lambda'` so as break `X-X` bond
(b) Assuming photons posses more energy than required to break the `X-X` bond, what X-then would be the KE per `X(g)` atom after the bond is broken ?

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