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Question
When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68×105J mol−1. What is the maximum wavelength that will cause a photoelectron to be emitted?
When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of 1.68×105J mol−1. What is the maximum wavelength that will cause a photoelectron to be emitted?
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Solution
The correct option is D λ=518 nm
The energy of a 300 nm photon =hv=hcλ
=6.626×10−34 J s×3.0×108 m s−1300×10−9 m
=6.626×10−19 J
The energy of a 300 nm photon =hv=hcλ
=6.626×10−34 J s×3.0×108 m s−1300×10−9 m
=6.626×10−19 J
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