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y Bookmarks Window Help saplinglearning.com Binn College, Bryan Campus CHEM 1411 calcuate the ning Jump to.. re 2/28/2018 12:05 AM 78.2/100 Gradebook Print CalculatorPeriodic Table Sapling Learning Caloulate the energy of a photon in kiloelectron volts (keV), which has a wavelength of 0.303 A figures are graded for this problem constants used to solve this problem should Note Number contain a minimum of four significant figures to avoid rounding errors. Be sure you do not round your answers untal the very end of your calculations. E- 3.76 keV There is additional feedback View this feedback bottom divider bar bar again to hide the additional feedback on the on the divider Incorrect Close OPrevious (> Give Up & View Solution #Try Again Exit NextExplanation / Answer
Wavelength of photon = 0.303 A
=0.303x10-10 m
We know energy of photon E = hc/lambda
where h = Planck's cnstant = 6.625x10-34 J.sec
c = velocity of light = 3.0x108 m/sec
Thus Energy E = 6.625x10-34 J.sec x 3.0x108 m/sec / 0.303x10-10 m
= 6.56x10-15 J
We knwo 1 electron volt (eV) = 1.602x10-19 J
Thus the energy in eV = 6.56x10-15 J x1 eV / 1.602x10-19 J
=4.095x104 eV
= 40.95 KeV
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