Calculating the Number of Photons in a Laser Pulse

Calculating the Number of Photons

When calculating the number of photons produced in a laser pulse, we can use the formula:

Energy of one photon

E = hf = hc/λ = (6.626 × 10⁻³⁴ J·s × 2.998× 10⁸ m·s⁻¹)/(633 × 10⁻⁹ m)= 3.138 × 10⁻¹⁹ J

Number of photons

No. of photons = 0.418 J × (1 photon/3.138 × 10⁻¹⁹ J) = 1.33 × 10¹⁸ photons

Therefore, the correct number of photons produced in the laser pulse is 1.33 × 10¹⁸ photons, not 2.756635753 x 10^36 as calculated incorrectly. By utilizing the energy of one photon and the given energy of the laser pulse, we can accurately determine the number of photons present.