When photons with a wavelength of 300 nm fall on lithium metal, electrons with kinetic energy of 150 kJ/mol are ejected. What is the minimum wavelength in nm of a photon needed to eject an electron out of lithium metal?

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When photons with a wavelength of 300 nm fall on lithium metal, electrons with
kinetic energy of 150 kJ/mol are ejected. What is the minimum wavelength in nm of a photon
needed to eject an electron out of lithium metal?
E= hF
Enogget photen
入F =c→ F= S
34:3
: 6.626 > 10-11 J
%3D
300 x 10-7
(6.62610-9J)(6.02210-23 me
Kinetic energy of one electron: 249K Tmd
399x
399kTmol -15ck5/mol= 249KJ/mol
399
%3.
Energy of photon with a wavelength of 300 nm:
Transcribed Image Text:When photons with a wavelength of 300 nm fall on lithium metal, electrons with kinetic energy of 150 kJ/mol are ejected. What is the minimum wavelength in nm of a photon needed to eject an electron out of lithium metal? E= hF Enogget photen 入F =c→ F= S 34:3 : 6.626 > 10-11 J %3D 300 x 10-7 (6.62610-9J)(6.02210-23 me Kinetic energy of one electron: 249K Tmd 399x 399kTmol -15ck5/mol= 249KJ/mol 399 %3. Energy of photon with a wavelength of 300 nm:
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