Alaser pulse with wavelength 532 nm contains 3.85 mj of energy. how many photons are in the laser pulse?

The number of photons that are in the laser pulse is about :

1.03 × 10¹⁶ photons

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is:

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

The photoelectric effect is an effect in which electrons are released from the metal surface when illuminated by electromagnetic waves with large enough of radiation energy.

E = Energi of A Photon ( Joule )

m = Mass of an Electron ( kg )

v = Electron Release Speed ( m/s )

Ф = Work Function of Metal ( Joule )

q = Charge of an Electron ( Coulomb )

V = Stopping Potential ( Volt )

Let us now tackle the problem!

Given:

wavelength = λ = 532 nm = 532 × 10⁻⁹ m

energy = E = 3.85 mJ = 3.85 × 10⁻³ J

Asked:

number of photons = N = ?

Solution:

Grade: High School

Subject: Physics

Chapter: Quantum Physics