Find the minimum energy needed to eject electrons

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Reference no: EM13129223

Ejecting Electrons with Light

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

HINT:
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).

Reference no: EM13129223

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