Can someone familiar with frequency, energy and momentum of a photon check this work for me please? I'm actually stuck on how to manipulate the information I have to solve the momentum equation p=mv. That's the correct one right?

Anyways...

First question was to find the frequency of the radiation if a photon has a wavelength of 5320 Angstroms. My work was...

V=speed of light/wavelength

1)(3.00x10^8 m/s/5320 Angstroms) *(10^-10)=5.64x10^-5 s-1

Did I do that right? I believe I had to multiply the answer by (10^-10) because that's how many angstroms are in a meter which would allow those units to cancel.

Then I need to find energy.

2) E=hv

(6.626x10^-34)(5.64x10^-5)=3.73x10^-?

I'm not sure of the exponents in the final answer as I don't have a scientific calculator on hand and the web ones won't give me an answer other than zero for that math. I'm assuming it's like -28 or so?

Ok so given that the above information is correct how would I use that to find the momentum of the photon?

Any help is greatly appreciated, thank you!