# Quick question: Finding the wavelength?

1. May 15, 2012

### nukeman

Quick question: Finding the wavelength??

1. The problem statement, all variables and given/known data

The energy of a photon is 5.87 x 10^-20 J. What is its wavelength in nanometers?

I use E = H(c/λ) Correct?

Since I am trying to find λ, I change it to this?

λ = H(c/E) ?

6.63x10^-34 x (3 x 10^8 / 5,87 x 10^-20)

= .000003

in nanometers, 3000

Is this correct? I don't think it is :(

2. Relevant equations

3. The attempt at a solution

2. May 15, 2012

### Staff: Mentor

Re: Quick question: Finding the wavelength??

You've lost a lot of precision through rounding. Why not stick to scientific notation for intermediate results? 3000 nm is in the ballpark, but you should have a couple more significant figures.

Last edited: May 15, 2012
3. May 15, 2012

### nukeman

Re: Quick question: Finding the wavelength??

Ohh.... So, I was correct? as in my method for solving this?