A Red Laser Pointer Emits Light at a Wavelength of 488

Multiple Choice

A red laser pointer emits light at a wavelength of 488 nm.If the laser emits 7.5 × 10^-4 J of energy per second in the form of visible radiation,how many photons per second are emitted from the laser?

A) 4.1 × 10^-19 photons/sec
B) 5.4 × 10^-16 photons/sec
C) 8.9 × 10¹⁴ photons/sec
D) 1.8 × 10¹⁵ photons/sec
E) 2.5 × 10¹⁸ photons/sec