Posted by **mary** on Thursday, October 21, 2010 at 12:57pm.

What is the frequency of a photon with an energy of 7.40 10-18 J? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 10-34 J·s.)

- (physics/chemistry) -
**drwls**, Thursday, October 21, 2010 at 1:47pm
You may have got this question in a chem glass, but it is really about physics.

E = h*frequency is the equation to use

h is Planck's constant, which you were given.

Solve for the frequency, in s^-1 (also called Hz)

You don't need to use the speed of light to answer this question. You would need that for the wavelength.

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