Question

Resources How many photons are produced in a laser pulse of 0.107 J at 611 nm? photons: 5.44 x1017

Answer 1

To find the photons are produced in a laser pulse of 0.107 J at 611 nm First find the energy of single photon Use the formula E = Where E energy Planck's constant = 6.626x10-34 J.s h A = wavelength (m) c speed of light (constant value) 3.0 x10 m/s Convert wavelength nm tom 611nm 1nm 10 m 61 1nm 611x10-9m = 6.11x10-m E = 6.626x 10 34 Jsx3.0x108 m/s Е XS 6.11x10 m E 3.25x1019 Now use the total energy of the las er pulse to find how many photons were needed for this output 1photon =3.29x1017 0.107Jx 3.25x10 Hence the photons are produced in a laser pulse of 0.107 J at 611 nm = 3.29 x107