6. When an electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of \( 1.68 \times 10^{5} \mathrm{~J} \mathrm{~mol}^{-1} \). What is the minimum energy needed to remove an electron from sodium? What is the minimum wavelength that will cause a photoelectron to be emitted?
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626 \times 10^{-34} \, \text{J s} \) (Planck's constant), \( c = 3.00 \times 10^8 \, \text{m/s} \) (speed of light), and \( \lambda = 300 \, \text{nm} = 300 \times 10^{-9} \, \text{m} \). Show more…
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