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Using Planck’s Constant…. Electromagnetic Spectrum Calculations. Who was Max Planck?. He was a German physicist and is considered as the founder of the quantum theory (Wikipedia 2011). I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
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Presentation Transcript Using Planck’s Constant…

### Electromagnetic Spectrum Calculations Who was Max Planck?
• He was a German physicist and is considered as the founder of the quantum theory (Wikipedia 2011).
• The symbol (h) is used to denote Planck’s constant, which he discovered in 1899. It is used as a proportionality constant between the energy and frequency of an electromagnetic wave (Wikipedia 2011).
• h = 6.626 x 10-34 Js (joule seconds)

Picture credit:

http://en.wikipedia.org/wiki/File:Max_Planck.png E = hv

Where, E = energy of the photon (J)

h = Planck’s constant (Js)

v = frequency of the wave (Hz)

E = hc/λ

Where, E = energy of the photon (J)

h = Planck’s constant (Js)

c = speed of light, 2.99 x 108 m/s

λ = wavelength of light (m)

Important Equations and their units When we see light from a neon sign, we are observing radiation from excited neon atoms. If this radiation has a wavelength of 640 nm, what is the energy of the photon being emitted?

Planck’s Practice Problems 1. Light with a wavelength of 614.5 nm looks orange. What is the energy, in joules, of a photon of this orange light?

2. A photon of light produced by a surgical laser has an energy of 3.027 x 10 -19

J. Calculate the frequency and the wavelength of the photon.

Planck’s Practice Problems Wikipedia 2011, Max Planck, viewed 10 September 2011,

< http://en.wikipedia.org/wiki/Max_Planck >.

Wikipedia 2011, Planck’s Constant, viewed 10 September 2011,

<http://en.wikipedia.org/wiki/Planck_constant>.

Works Cited