{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ch 5 part 1

# A laser that emits light energy in pulses of short

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: given frequency- given energy 11 Example. A laser that emits light energy in pulses of short duration has a frequency of 4.69 x 1014 s-1 and 1.3 x 10-2 J (per each particle) of energy during each pulse. How many quanta of energy (or photons) are there per pulse? given frequency, so we can determine the energy associated with it 1. Calculate the energy for one quantum. (packet or bundle) E = hν E = (6.63x10 − 34 Js)(4.69 x1014 s −1 ) hertz E = 311x10 −19 J . total energy 2. Determine the quanta. based on the total energy # quanta = 1.3 x 10-2 J / 3.11 x 10-19 J = 4.2 x 1016 quanta (overall energy/ energy for each quantum) ASIDE: http://www.unitconversion.org/unit_converter/frequency-wavelength.html 12 6 05-Sep-13 The photoelectric effect this theory helped to associate energy of light with frequency Planck’s theories were used to explain a number of observations that had been troubling scientists. Chief among these was that light shining on a metal surface causes the emission of electrons, but only at certain frequencies. Einstein extended Planck’s ideas and suggested that each quanta of light behaves as a tiny particle photon...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online