What is energy of photon yellow with frequency of 5.11x10 ^14

Answer 1

The energy of a photon of yellow light is given by E = hf, where h is Planck's Constant equal to 6.62607540×10^-34 Joule • Second.

Then Energy equals 6.62607540×10^-34 Joule • Second times 5.11×10¹⁴ Cycles Per Second, which simplifies to 3.385924529 ×10^-19 Joule. (Cycles have no dimension.)