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Waves. Characteristics of Waves Frequency Amplitude.

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Presentation on theme: "Waves. Characteristics of Waves Frequency Amplitude."— Presentation transcript:

1 Waves

2 Characteristics of Waves

3 Frequency

4 Amplitude

5 Wavelength

6 Calculating wavelength and frequency  C = λv  C = speed of light 3x10 8 m/s  Λ = wavelength in meters  v = frequency in Hz  What is the wavelength of a microwave having a frequency of 3.44x10 9 Hz?

7 Practice  Do one on your own  Complete worksheet for homework

8 Electromagnetic Wave

9

10 What does the prism reveal about visible light?  Write your thoughts in your notebook

11 EM Spectrum

12

13 Visible Light

14 Refraction  Mediums refract light according to specific wavelength

15 Particle Nature of light

16 Quanta  Max Planck  Matter can gain or lose energy in small, specific amounts called QUANTA  E quantum = hv  E = energy  h = Planck’s constant 6.626x JS  V = frequency

17 What does this mean  Energy is absorbed or released in discrete whole quanta 1hv, 2hv, 3hv 1hv, 2hv, 3hv  Cool but the wave model could not not explain the photoelectric effect

18 Photoelectric effect  Shine light at a metal and try to eject electrons

19 Photoelectric effect  No matter how long you shine lower energy light (lower frequency), electrons are not ejected  But even a dim light of a certain higher frequency does eject the electrons

20 E quantum = hv  E is energy (Joules)  h = Planck’s constant 6.626x10-34Js  v = frequency

21 Einstein  Proposed that light acts like a wave AND a particle.  Think of it as a stream of tiny particles  These particles are called photons  PHOTON = particle of electromagnetic radiation with no mass that carries a quantum of energy

22 Atomic Emission spectrum  Each element has a unique spectral signature


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