The energy of a given wave in the electromagnetic spectrum is 2.64 * 10-21 joules, and the value of Planck's constant is 6.6 * 10-34 joule·seconds

4.00 * 1012 hertz

2.34 * 10-12 hertz

1.30 * 1013 hertz

2.52 * 10-6 hertz

8.11 * 10-7 hertz

We are given

E = 2.64 * 10-21 J

h = 6.6 * 10-34 J s

The options given below are frequencies, therefore, the question must be asking about the frequency fo the given wave

The equation is

E = h f

Simply substitute and solve for f which is the frequency

f = 2.64 * 10-21 J / 6.6 * 10-34 J s

f = 4.00 * 1012 hertz