We’re being asked to determine the wavelength of radiation (light) that must be used to eject electrons from a chromium metal.
When photons with enough energy hit the surface of a metal, electrons are emitted. This phenomenon is known as the Photoelectric Effect.
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
ν = frequency = Hz or s-1
• Ework function is the work function or threshold frequency of the metal (minimum energy required to remove an electron from the metal)
The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 2500 km/s?
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