1. Electromagnetic Spectrum Light as a Wave

2. Learning Objectives Understand the electromagnetic spectrum Understand the relationships between and perform calculations involving wavelength, frequency, and the speed of light Electromagnetic Spectrum

3. Electromagnetic radiation – a form of energy that displays characteristics of a wave as it moves through space Light as a Wave

4. Waves are characterized by wavelengths and frequencies – Wavelength ( λ ) – the distance between the same points on two successive waves Units of meters (m) – Frequency ( f ) – the number of wave cycles that are completed during a unit of time Units of hertz, Hz, or inverse seconds, s -1 or 1/s Light as a Wave

5. Speed of light ( c ) – the speed at which electromagnetic radiation travels – Speed of light is a constant Units of speed of light are meters per second Light as a Wave

6. Finding Frequency, Given Wavelength Ex) What is the frequency of electromagnetic radiation whose wavelength is 5.50 × 10 –7 m? IV.Conversions needed? V.Intermediates needed? VI.Solve VII.Does the result make sense? I.Strategy II.Given and unknown III.Formula No. Yes.

7. Finding Wavelength, Given Frequency Ex) What is the wavelength of electromagnetic radiation whose frequency is 6.50 × 10 14 Hz? IV.Conversions needed? V.Intermediates needed? VI.Solve VII.Does the result make sense? I.Strategy II.Given and unknown III.Formula No. Yes.

8. Learning Objectives Understand the electromagnetic spectrum Understand the relationships between and perform calculations involving wavelength, frequency, and the speed of light Electromagnetic Spectrum