1. standard: 1i, 1j terms: p article: 144 mastering concept: 146(30-38) practice prblems: 121(1-4), 124(5-6 lab write up: 125 home lab:954 #5 Homework cornell notes: 5.1 sec. assessment: 126 (7-11) mastering problems: 147(65-76)

2. New Terms Electromagnetic radiation Wavelength Frequency
A form of energy that has wavelike behavior
Wavelength
The shortest distance between equivalent points on a wave
Frequency
The # of waves that pass through a given point per second

6. relationship Wavelength vs. frequency
As wavelength increase, frequency decrease

7. Electromagnetic spectrum Quantum
All forms of electromagnetic radiation
Quantum
The minimum amount of energy that can be gained or lost by an atom
Planck’s constant
Value used to determine the energy of a quantum

8. Photoelectric effect
phenomenon where electrons are emitted from a metal’s surface when light of a certain frequency shines on the surface.

10. Sunlight takes about 8 minutes 17 seconds to travel the average distance from the surface of the Sun to the Earth.
Exact values: 299,792,458 meters per second

11. Calculating wavelength of an EM wave
Radio waves are used to transmit information on various channels. What is the wavelength of a radio wave having the frequency of 5.40 X 1010 Hz?
V = 5.40 X 1010 Hz
C = 3.00 X 108 m/s
λ = ? m
C = λV
λ = C/V = 3.00 X 108 m/s
5.40 X /s
= 5.5 x 10-3 m
1/s or s-1
3.00 Exp or EE 8 ÷
5.40 Exp or EE 10 =

12. Practice Problems: P. 121 (1-4)
What is the frequency of green light, which has a wavelength of 4.9 x 10-7m?
An X ray has wavelength of 1.15 x 10-10m. What is its frequency?
What is the speed of an electromagnetic wave that has a frequency of 7.8 x 106 Hz?
A popular radio station broadcasts with a frequency of 94.7 MHz. What is the wavelength of the broadcast? (1MHz = 106 Hz)

13. Calculating wavelength of an EM wave
What is the frequency of green light, which has a wavelength of 4.9 x 10-7m?
C = 3.00 X 108 m/s
λ = 4.9 x 10-7m
V = ?
C = λV
V = C/λ = 3.00 X 108 m/s
4.9 x 10-7m
= x /s
3.00 Exp or EE 8 ÷
4.90 Exp or EE -/+ 7 =

14. Calculating wavelength of an EM wave
2. An X ray has wavelength of 1.15 x 10-10m. What is its frequency?
C = 3.00 X 108 m/s
λ = 1.15 x 10-10m
V = ?
C = λV
V = C/λ = 3.00 X 108 m/s
1.15 x 10-10m
= x /s
3.00 Exp or EE 8 ÷
1.15 Exp or EE -/+ 10 =

15. Your Turn...
3. What is the speed of an electromagnetic wave that has a frequency of 7.8 x 106 Hz?
C = 3.00 X 108 m/s

16. Your Turn...
4. A popular radio station broadcasts with a frequency of 94.7 MHz. What is the wavelength of the broadcast? (1MHz = 106 Hz)
C = 3.00 X 108 m/s
V = 94.7 MHz (106 Hz = 1MHz )=9.47 x 107 s-1
λ = ?
C = λV
λ= C/V = 3.00 X 108 m/s
9.47 x 107 s-1
= m
3.00 Exp or EE 8 ÷
9.47 Exp or EE -/+ 7 =

17. Flame Test Lab 125

18. Gamma
Radio

19. Visible EM Radiation
The human eye can detect EM radiation within a 400 nm – 750 nm range.
This radiation is processed and interpreted by our brains as color.

20. Element Color λ (nm) V =C/λ C=3x108 E = hv h=6.626x 10-34
λ (m) m=109nm
V =C/λ C=3x108
E = hv h=6.626x 10-34
Barium Ba
Yellow
590
Copper Cu
Green/blue
520
Sodium Na
orange
630
Calcium Ca
Red/ Orange
620
6.2x10-7
4.8x1014
3.2x10-19

21. Element Color λ (nm) V =C/λ C=3x108 E = hv h=6.626x 10-34
λ (m) m=109nm
V =C/λ C=3x108
E = hv h=6.626x 10-34
Lithium
Red
Sodium
Yellow
Potassium
violet
Calcium
Red/ Orange
620
6.2x10-7
4.8x1014
3.2x10-19
Strontium
Bright red

22. Practice Problems: 124(5-6)
5. What is the energy of each of the following types of radiation?
6.32 x 1020 s-1
9.50 x 1013 Hz
1.05 x 1016 s-1

23. Practice Problems: 124(5-6)
5. What is the energy of each of the following types of radiation? x 1020 s-1
v = 6.32 x 1020 s-1
h = X J.s
? J
Ephoton = hV
Ephoton = 6.32 x 1020 s-1 (6.626 X J.s)
= x J
6.32 Exp or EE 20 x
6.626 Exp or EE -/+ 34=

24. Practice Problems: 124(5-6)
5. What is the energy of each of the following types of radiation? 9.50 x 1013 Hz
v = 9.50 x 1013 s-1
h = X J.s
? J
Ephoton = hV
Ephoton = 9.50 x 1013 s-1 (6.626 X J.s)
= x J
1/s or s-1
9.50 Exp or EE 13x
6.626 Exp or EE -/+ 34=

25. Practice Problems: 124(5-6)
6. Use Figure 5-5 to determine the types of radiation described in problem 5
6.32 x 1020 s-1 b x 1013 Hz
c x 1016 s-1