1. Electromagnetic Spectrum Chemistry 6(B)

2. Lesson Objectives Explore the electromagnetic spectrum Understand the mathematical relationships between energy, frequency, and wavelength of light Electromagnetic Spectrum

3. Electromagnetic spectrum includes a wide range of radiation – Electromagnetic radiation – form of energy that displays characteristics of a wave as it moves through space Electromagnetic Spectrum of Radiation

4. Visible light is type of electromagnetic radiation – Comprises a small portion of the electromagnetic spectrum Ranges from 400–700 nm Visible Light User:Tatoute [GFDL ]

5. Waves are characterized by – Wavelength (λ) – distance between two successive peaks Units of meters (m) – Frequency ( f ) – number of wave cycles completed during a unit of time Units of hertz (Hz) Wave diagram Wave Nature of Light

6. Wavelength and frequency are inversely proportional Mathematical association between wavelength and frequency expressed in relation to speed of light (c) c = 3.00 x 10 8 m/s Wave Nature of Light Wave diagram

7. Wave Calculation 1.Write unknown and givens λ= 5.50 x 10 -6 m c = 3.00 x 10 8 m/s f = ? 2.Identify the formula and rearrange, if needed 3.Convert units and find intermediates, if needed 4.Plug in and solve 5.Make sure the answer is reasonable Ex) What is the frequency of a photon whose wavelength is 5.50 x 10 -6 m?

8. Energy of waves is – Directly proportional to frequency – Inversely proportional to wavelength Energy of Waves Energy

9. Lesson Objectives Explore the electromagnetic spectrum Understand the mathematical relationships between energy, frequency, and wavelength of light Electromagnetic Spectrum