What are the steps to solve this?

Thank you for the opportunity to help you with your question:

Use Planck-Einstein's relation, where h is Planck's constant; E, energy, and v, frequency [1];

E = h.v = (6.626×10^{−34} J s) x(5.90x10^{14} s^{−1} )= 3.90^{−19} J

and the value of Planck's constant is h= 6.626×10^{−34} J s

References:

[1] Planck Constant. In Wikipedia. Retrieved October, 2015, from http://en.wikipedia.org/wiki/Planck_constant^{ }

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