2. SPECTRUMSPECTRUMSPECTRUMSPECTRUM

3.  Electromagnetic Spectrum

4.   Wave Characteristics  WAVELENGTH – the distance between two consecutive wave peaks; symbolized by the Greek letter lambda (λ)  FREQUENCY – indicates how many wave peaks pass a certain point at a given time; symbolized by the Greek letter nu ( ѵ ) EM Radiation Travels in Waves

5.   Wave Characteristics  AMPLITUDE – height from origin to crest or origin to trough.  SPEED – ALL waves travel at a speed of 3.00 x 10 8 m / s EM Radiation Travels in Waves

6.  Wave Characteristics

7.   Max Planck – matter can gain or lose energy only in a small, specific amount called a quantum.  Albert Einstein - light is made up of a stream of tiny particles called photons.  A photon carries a quantum (a discreet amount) of energy. Light has properties of both waves & particles.

8.   C  the speed of light is 3.00 x 10 8 m/s  λ  ( lambda), the wavelength is normally given in the SI units of m, cm or nm  Ѵ  ( nu), the frequency of a wave is measured by counting the number of waves that pass a certain point per second. The SI unit for frequency is one hertz which is written 1 / s or s -1 Wave Terminology and Units

9.   The speed of light is equal to the frequency of the wave multiplied by its wavelength.  c = λ ѵ  We can rearrange the equation if we are trying to find wavelength or frequency. λ = c/ ѵ or ѵ = c/ λ Putting it Together

10.  WWhat is the wavelength of a microwave having a frequency of 3.44 x 10 9 Hz? WWe are looking for wavelength so we will use λ = c/ ѵ  λ λ = 3.00 x 10 8 m/s 3.44 x 10 9 Hz Practice

11.   λ =.872 X 10 -1 m or 8.72 X 10 -2 m Answers