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Chapter 25

Chapter 25. Light and the Electromagnetic Spectrum. Electromagnetic Waves. Consist of an electric field and a magnetic field at right angles to each other and to the direction of the wave. Electromagnetic Waves (Remember). Transverse waves Carry energy Do not require matter

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Chapter 25

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  1. Chapter 25 Light and the Electromagnetic Spectrum

  2. Electromagnetic Waves • Consist of an electric field and a magnetic field at right angles to each other and to the direction of the wave.

  3. Electromagnetic Waves (Remember) • Transverse waves • Carry energy • Do not require matter • Do not cause matter to vibrate • Cause electromagnetic & magnetic fields to vibrate.

  4. Electromagnetic Waves • Created by charged particles moving back & forth, creating electric and magnetic fields that vibrate. • The source of EMWs is charged particles changing speed or direction.

  5. Electromagnetic Waves • EMWs travel at the speed of light, 299792.458 km/s or 186000 mi/s.

  6. 25-2 The Electromagnetic Spectrum

  7. Electromagnetic Spectrum (EMS) • All EMW travel at the same speed. • The waves are arranged in order of wavelength or frequency on the EMS

  8. Electromagnetic Spectrum • Remember: v = λ x F • Because all EMWs travel at the same speed, the wavelength and frequency change. • The longest λ have the lowest frequency. • The shortest λ have the highest frequency.

  9. Electromagnetic Spectrum • An arrangement of electromagnetic waves in order of wavelength and frequency. • Long λ,low freq. to short λ, high freq. • Amount of energy increases with freq.

  10. Visible Light

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