How much will the kinetic energy an...
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How much will the kinetic energy and total energy of an electron in H atom change if the atom emits a photon of wavelength 4860Å?

JEE/Engineering Exams
Chemistry
Solution
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Explanation As the threshold energy remains constant, change in energy is equal to change in kinetic energy. Change in kinetic energy is given by ( Delta E=(1 / 2) m v^{wedge} 2=h c / lambda ) ( Delta E=left(6.6 times 10^{wedge}-34 times 3 times 10^{wedge} 8right) /left(4.86 times 10^{wedge}-7right) ) ( Delta E=4.074 times 10^{wedge}-19 mathrm{J} ) ( Delta E=2.546 mathrm{eV} ) Hence, change in kinetic energy and change in total energy both is ( 2.546 mathrm{eV} )
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