Posted by **Trina** on Saturday, December 8, 2012 at 2:50am.

The equation for photon energy, , is

where = 6.626×10−34 (Planck's constant) and = 3.00×108 (the speed of light).

What is the wavelength, , of a photon that has an energy of = 3.99×10−19 ?

How do go about solving this? I multipled the constant w/ the speed of light and divided it by the proton energy but its not correct

- Chemistry -
**DrBob222**, Saturday, December 8, 2012 at 2:02pm
You omitted the important stuff in your definition workup.

w = wavelength

c = speed of light = 3E8 m/s

h = Planck's constant = 6.626E-34 J.s

E = energy in J.

E = hc/w

3.99E-19 = 6.626E-34*3E8/w

w = 6.626E-34*3E8/3.99E-19 = ?

If you still have a problem, put your exact work in a post and let us take a look at it. One problem students often make is using too many significant figures in the answer. Check that too.

- Chemistry -
**Rosi**, Friday, October 24, 2014 at 2:38pm
A photon has a wavelength of 6.2 meters. Calculate the energy of the photon in joules. (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is

2.998 × 108 m/s)? I'm confused in how to find the answeer.

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