Fred points a toy laser gun at a wall. considering that the frequency of the gun's light is 4.91 × 1014 hertz and that planck’s constant is 6.61 × 10-34 joule·seconds, what is the energy of the laser light?
a) 3.24 × 10-21 joules
b) 4.91 × 1015 joules
c) 2.04 × 10-21 joules
d) 4.92 × 10-18 joules