Hi there.(adsbygoogle = window.adsbygoogle || []).push({});

I am a student from Spain and I am about to join the University but I have to pass physics at High School.

Here It is:

The work of extracting an Eletron in a metal is 3.8 eV. Calculate the minimum frequency needed to start the electron.

This is what I did.

[tex]\[E = \phi + Ec\][/tex]

Regarding to Einstein's equation of photoelectric effect:

[tex]\[h\nu = h\nu _0 + \frac{1}{2}mv^2 \][/tex]

When I got to this point, I assumed that the electron's velocity would be zero and then:

[tex]\[\nu = \frac{{3.8}}{{6.63\cdot10^{ - 34} }} = 5.73\cdot10^{33}[/tex]

Hertzios

Is everything alright?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Quantum mechanics.

**Physics Forums | Science Articles, Homework Help, Discussion**