Spectroscopy
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What is the number of quanta of radiation of yellow light of wave length 600nm required to make one joule of energy?
Ulex says
Yellow (sodium D-lines) , frequency = 5 x 1014 Hz
Energy = h x frequency where h is Planck’s constant
= 6.6 x 10-34 x 5 x 1014 J
= 3.3 x 10-19 J
This is the energy per quantum, so the number of quanta per Joule is the reciprocal of this.
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updated: 12 May 2006
