Question

Ultraviolet radiation has a frequency of 6.8×1015 Hz. What is the energy associated with this frequency?

Answer 1

Use Planck's equation (E=hv) to solve.  where frequency (v) of ultrviolet radiation is 6.8 × 1015 1/s.   The variable h is a constant equal to 6.63 × 10-34 J·s
E= (6.8 × 1015 1/s)x(6.63 × 10-34 J·s)