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Electrons & light

Electrons & light. The duel nature of electrons Book reference: Chapter 13 pages 372 - 375 Question 11 & 12. Electromagnetic Energy. Energy transferred in the form of waves

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Electrons & light

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  1. Electrons & light The duel nature of electrons Book reference: Chapter 13 pages 372 - 375 Question 11 & 12

  2. Electromagnetic Energy • Energy transferred in the form of waves • All electromagnetic radiation -- from radio waves to x-rays -- travel at the speed of light. In empty space this speed is approximately 300,000 kilometers per second! 3.0 x 108 m • Wave shape and mechanics http://id.mind.net/~zona/mstm/physics/waves/partsOfAWave/waveParts.htm sine wave wavelength frequency amplitude

  3. Waves

  4. Frequency & wavelength • The relationship between frequency and wavelength define the type of energy • These two variables are inversely proportional • High frequency (n): small wavelength (l) • The constant is light speed (C), so • C = n x l

  5. Units • Frequency = cycles per second • Cycles/second = 1/sec = sec-1 = hz (most used) • Wavelength in meters or nanometers • Light speed m/sec , cm/sec • Be careful and watchful of units make sure they match

  6. C = n x l Find the wavelength of energy if the frequency is 2.4 x 1014 hz Find the wavelength of the radio wave, FM 102 3.0 x 108m/sec/2.4 x 1014hz 1.3 x 10-6 m 3.0 x 108m/sec/1.02 x 108hz 2.94 m Sample Problems

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