# Chemistry (Electrons in Atoms)

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.

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1. E = hc/wavelength.
You don't need to go through the frequency if you use the above equation. Wavelength must be inserted in meters.

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2. are the units for energy J*s

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posted by Katie
3. yes, if c is in m/s, and h is in joules-seconds

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4. 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.

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5. the wavelength of the light 310nm. calculate the wave length in meters.

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