Total energy (ΔE) in photoelectric effect can be calculated using the following equation:
• ΔE is the total energy or the energy of the light/photon/radiation and can be calculated using the equation:
Etotal energy = J
h = Planck’s constant = 6.626x10-34 J∙s
λ = wavelength = m
↑ ΔE → ↓ λ
• Ework function is the work function or threshold frequency of the metal (minimum energy required to remove an electron from the metal)
• Ekinetic energy is the kinetic energy of the ejected electron and can be calculated using the equation:
Ekinetic energy = J
m = mass of e- = 9.11x10-31 kg (can be found in books or the internet)
v = velocity of the e- = m/s
↑ velocity → ↑ kinetic energy
Light from three different lasers (A, B, and C), each with a different wavelength, was shined onto the same metal surface. Laser A produced no photoelectrons. Lasers B and C both produced photoelectrons, but the photoelectrons produced by laser B had a greater velocity than those produced by laser C. Arrange the lasers in order of increasing wavelength.
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