# Problem: What is the threshold frequency for sodium metal if a photon with frequency 6.66 × 1014 s−1 ejects an electron with 7.74 × 10 −20 J kinetic energy? Will the photoelectric effect be observed if sodium is exposed to orange light?

###### FREE Expert Solution

Recall: According to the photoelectric effect, an electron can be ejected from the surface of a metal if it's hit with photons of sufficient energy. The kinetic energy (KE) of the ejected electron is related to the energy of the photon (Ephoton) hitting the metal surface by this equation:

(1)

where φ = work function of the metal, which is the minimum energy of a photon that is needed to eject an electron. The threshold frequency, v0, of a metal is the minimum frequency needed to eject an electron and is given by:

(2)

where h = Planck's constant (6.626 × 10–34 J • s).

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###### Problem Details

What is the threshold frequency for sodium metal if a photon with frequency 6.66 × 1014 s−1 ejects an electron with 7.74 × 10 −20 J kinetic energy? Will the photoelectric effect be observed if sodium is exposed to orange light?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Photoelectric Effect concept. You can view video lessons to learn Photoelectric Effect. Or if you need more Photoelectric Effect practice, you can also practice Photoelectric Effect practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Berrie's class at KU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry - OpenStax 2015th Edition. You can also practice Chemistry - OpenStax 2015th Edition practice problems.