Enter a numberwith the correct number of significant figures. Enter a numberwith

Question

Enter a numberwith the correct number of significant figures. Enter a numberwith the correct number of significant figures. Light with a wavelength of 405 nm fell on a strontium surface, andelectrons were ejected. If the speed of an ejected electron is 3.26 x 10^5 m/s, what energy was expended inremoving the electron from the metal? Express the answer in joules(per electron) and in kilojoules per mole (of electrons). Enter a numberwith the correct number of significant figures. J/electron Enter a numberwith the correct number of significant figures. kJ/mol

Explanation / Answer

E = hc/ - hc/ = energy of the ejecting photon h = planck's constant: 6.626e-34 Js c = speed of light : 3e8 m/s =work function: strontium = hc/ -E E = (1/2) mv^2 = (1/2)(9.11e-31)(3.26e5)^2 = 4.84e-20 J = (6.626e-34)(3.0e8)/ (405e-9) - (4.84e-20) = 4.42e-19 J/electron You can do the conversion to Kj/mol

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