What are the steps to solve this?
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Use Planck-Einstein's relation, where h is Planck's constant; E, energy, and v, frequency ;
E = h.v = (6.626×10−34 J s) x(5.90x1014 s−1 )= 3.90−19 J
and the value of Planck's constant is h= 6.626×10−34 J s
 Planck Constant. In Wikipedia. Retrieved October, 2015, from http://en.wikipedia.org/wiki/Planck_constant
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