Homework Help: Chemistry (Electrons in Atoms)

Posted by Katie on Monday, May 23, 2011 at 7:09pm.

The wavelength of visible light varies from 0.40 μm to 0.70 μm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 0.67 μm

HINT: From the wavelength and the speed of light, we can get the frequency. Then the energy is simply hf. Use Planck's constant h in the proper units.

Chemistry (Electrons in Atoms) - DrBob222, Monday, May 23, 2011 at 7:12pm
E = hc/wavelength.
You don't need to go through the frequency if you use the above equation. Wavelength must be inserted in meters.
Chemistry (Electrons in Atoms) - Katie, Monday, May 23, 2011 at 7:15pm
are the units for energy J*s
Chemistry (Electrons in Atoms) - bobpursley, Monday, May 23, 2011 at 7:17pm
yes, if c is in m/s, and h is in joules-seconds
Chemistry (Electrons in Atoms) - DrBob222, Monday, May 23, 2011 at 7:34pm
Energy is in J.
E = hc/w. h has units J*s. c is m/s. w is in m so we have J*s*m/s/m. m and s cancel to leave E in J.
Chemistry (Electrons in Atoms) - Anonymous, Thursday, November 15, 2012 at 7:53pm
the wavelength of the light 310nm. calculate the wave length in meters.

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