Quantum beginners question help plz!!!!!?

Question

4 cesium I have these numbers.

6.2E-7 meters: 1.66E-20 Joules

With this how do I convert wavelengths to frequencies
My instructor told me to use f=v=c/lambda where c is the speed of light.
Can you guys b more specific and tell me exactly what to plug in where n stuff. THX ALOT

Answer 1

There are two formulas, given the data you have provided:

E = hν means that the energy of a photon is given by its frequency (ν) times Planck's constant (h). Rearranging gives
ν = E/h

Also, there is the law λν = c, which means that the wavelength (λ) times the frequency (ν) is equal to the speed of light (c). Rearranging gives
ν = c/λ

Answer 2

For any electromagnetic radiation, the frequency X the wavelength = c (the speed of light).

So, take 3 X 10^8 m/sec and divide it by the wavelength , and you'll have the frequency.

That help?