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Energy of a photon is calculated using the formula

$ E_p$ = ( Plancks constant x speed of light / wavelength)

$ E_p$ = ( 6.634 x $10^ -34$ J .s x 3 x $10 ^8$ m$s^-1$ ) / 13.2 x $10^-9$ m

$ E_p$ = ( 6.634 x $10^ -34$ J .s m $s^-1$ / 13.2 x $10^-9$ m

$ E_p$ = ( 19.902 x $10^ -26$ J .s m $s^-1$) / 13.2 x $10^-9$ m

$ E_p$ = ( 19.902 x $10^ -26$ J .s m $s^-1$) / 13.2 x $10^-9$ m

 = 1.507 x $10^-15$ J 
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