1. Chapter 4 Electron Configurations

2. Fusion and Fission Figure 4-1 pg 125 The ultimate source of energy for the Earth is the sun. Nuclear fusion provides this energy What is the difference between fusion and fission?

3. Fusion and Fission Nuclear fusion is when light nuclei like hydrogen and deuterium combine to form heavier nuclei like helium. Nuclear fission involves heavy nuclei like uranium and they are broken apart into smaller nuclei like strontium and xenon

4. Waves Light travels in waves Light is a form of electromagnetic radiation X-rays, gamma rays and radio waves are other forms of electro- magnetic radiation

5. Electric Fields and Magnetic Fields Electric Fields oscillate vertically to the direction of the wave Magnetic Fields oscillate horizontally to the direction of the wave. What is the angle between the electric and magnetic fields?

6. Electric and Magnetic Fields What is the angle between the electric and magnetic fields? 90°

7. Four Characteristics of Waves 1. Amplitude 2. Wavelength 3. Frequency 4. Speed

8. Amplitude The height of the wave. Measure from origin to crest. Brightness or intensity of light depends on the amplitude.

9. Wavelength The wavelength is the distance between successive crests. The distance a wave travels in one full cycle. The light we see comes in wavelengths between 400 and 750 nanometers.

10. Frequency The frequency is how fast the wave oscillates up and down. It is the number of times a wave completes the up and down cycle in one second. Expressed as 1/second or s -1 this measurement is called a Hertz

11. Speed Light moves at a constant rate of speed regardless of its wavelength. 3.00 X 10 8 meters per second (speed of light) This means there is a relationship between wavelength and frequency Lambda= wavelength C= speed of light Nu = frequency

12. Keeping Time Pg 127 fig. 4-4 Particles in a quartz crystal vibrate at a characteristic frequency and are used to keep time. What other ways can be used that you know of?

13. Keeping Time Pg 127 fig. 4-4 What other ways can be used that you know of? Sundial Pendulum hourglass

14. Electromagnetic Spectrum Visible Spectrum Roy G Biv Violet is the shortest wavelength (highest frequency) Red is the longest wavelength (lowest frequency)

15. In a prism which wavelength is refracted the most?

16. In a prism which wavelength is refracted the most? VIOLET

17. Electromagnetic Spectrum Invisible Spectrum Microwaves Radiowaves X-rays

18. Assignment Review pages 125-129 Answer questions 1-4 on page 129 Define the 4-1 vocabulary words on page 155 Vocabulary Words Electromagnetic Radiation Amplitude Wavelength Frequency Speed of Light Visible Spectrum