What Is the Number of Photons Per Second Given Off

Multiple Choice

What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm.

A) 6.34 × 10¹⁸ photons/s
B) 5.42 × 10¹⁸ photons/s
C) 3.11 × 10¹⁸ photons/s
D) 25.3 × 10¹⁸ photons/s
E) 14.5 × 10¹⁸ photons/s