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'''E = hf'''
'''E = hf'''
where '''f''' is the frequency of the electromagnetic wave and h is Plank's constant and has the numerical value of 6.626*10^-34 J*s or 4.135*10^-15 eV*s.
where '''f''' is the frequency of the electromagnetic wave and h is Plank's constant and has the numerical value of 6.626*10<sup>-34</sup>[[Joule|Joules]] or 4.135*10<sup>-15</sup>electron volts (eV).