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    Ejecting Electrons with Light

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    The minimum frequency of light needed to eject electrons from a metal is called the threshold.

    Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 3.27*10^14s^-1.

    With what kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of lamda = 245 nm?

    KE_electron = _________ J

    Energy is related to frequency via E = hv.

    The energy of the ejected electron is the difference between the minimum required energy and the energy of the light. You're given the wavelength of the light (lambda = 245 nm) which you'll need to convert to energy using E = hc/lambda.

    Recall that h is Planck's constant (h = 6.626*10^-34 J*s) and c is the speed of light (c=2.998*10^8 m/s).

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    Solution Preview

    1. Solving for the minimum energy needed to eject the electron:
    E = h?
    E = (6.626 × 10-34 J·s)(3.27 x 1014/s)
    E = 2.17 x 10-19 J

    2. To solve for the ...

    Solution Summary

    This solution provides calculations for various questions involving ejecting electrons with light.