# Problem: Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10 15 s-1 before it can eject an electron from its surface via the photoelectric effect. (a) What is the minimum energy needed to eject an electron?

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###### FREE Expert Solution

We’re being asked what is the minimum energy needed to eject an electron from a molybdenum metal. The minimum frequency of radiation that must be absorbed by the metal is 1.09x1015 s-1.

We can calculate the minimum energy from the minimum frequency absorbed using the equation:

$\overline{){\mathbf{∆}}{\mathbf{E}}{\mathbf{=}}{\mathbf{h}}{\mathbf{\nu }}}$

E = energy = J
▪ h = Planck's constant = 6.626x10-34 Js
ν = frequency = Hz or s-1

###### Problem Details

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10 15 s-1 before it can eject an electron from its surface via the photoelectric effect. (a) What is the minimum energy needed to eject an electron?