8/2018 12:05 AM A 20/100 Print Calculator Periodic Table n 3 of 10 Sapling Learn

Question

8/2018 12:05 AM A 20/100 Print Calculator Periodic Table n 3 of 10 Sapling Learning Calculate the energy of a photon in kiloelectron volts (keV), which has a wavelength of 0793 A Note: Significant figures are graded for this problem constants used to solve this problem shoud Number contain a minimum of four significant figures to avoid rounding errors. Be sure you do not round your answers until the very end of your calculations keV Hint O Prevous Gintup:tohtasaation Q Check Answer + Next Pages 49 27

Explanation / Answer

Given:
lambda = 7.93*10^-11 m

use:
E = h*c/lambda
=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(7.93*10^-11 m)
= 2.507*10^-15 J
= (2.507*10^-15)/(1.602*10^-19) eV
= 1.56*10^4 eV
= 15.6 KeV
Answer: 15.6 KeV

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