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1601137 1601137
wrote...
Posts: 2
Rep: 0 0
3 years ago
The work function of potassium metal is 221
kJ/mol
. Will photons of violet light with = 390
nm
cause electrons to be ejected from a sample of potassium?
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Answer verified by a subject expert
Laser_3Laser_3
wrote...
Subject Expert
Posts: 304
3 years ago
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Hi,

 E= hf = h*c/λ
 E = 6.62607004 × 10-34 * 3.0*10^8/(390*10^-9)
 E= 5.097*10^-19 J/photon = 306.9 kJ/mol

So yes the photon will violet light will cause electron ejected from that sample of potassium.
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