Electromagnetic radiation with a wavelength of 575 nm appears as yellow light to the human eye.The energy of one photon of this light is 3.46 × 10^-1⁹ J.Thus,a laser that emits 1.3 × 10^-² J of energy in a pulse of light at this wavelength produces ________ photons in each pulse. A) 2.7 × 10^-1⁷ B) 7.8 × 10^-24 C) 2.2 × 10¹⁹ D) 3.8 × 10¹⁶ E) 6.5 × 10¹³

Question

Quizplus · Accepted Answer

To find the number of photons in each pulse, we need to divide the total energy in the pulse by the energy of one photon. 
Number of photons = Total energy in the pulse / Energy of one photon = (1.3 × 10^-12 J) / (3.46 × 10^-19 J/photon) 
Number of photons = 3.76 × 10^6 photons/pulse 
Therefore, the best choice is D.

Electromagnetic Radiation with a Wavelength of 575 Nm Appears as Yellow