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## The Electromagnetic Spectrum

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### Chapter 4 The Electromagnetic Spectrum Part 1 Demonstration Gas spectral tubes: Neon Argon Visible Light Part of the Electromagnetic Spectrum All types of ... – PowerPoint PPT presentation

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Title: The Electromagnetic Spectrum

1
Chapter 4
• The Electromagnetic Spectrum
• Part 1

2
Demonstration
• Gas spectral tubes
• Neon Argon

3
Visible Light
• Part of the Electromagnetic Spectrum

4
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5
All types of electromagnetic energy move in waves.
• Light and sound move by waves.
• Light moves at
• 3 x 108 m/s
• Sound moves at
• 340 m/s
• 1 mile 1609 m

6
All types of electromagnetic energy move in waves.
• Light moves at
• 3 x 108 m/s
• Sound moves at
• 340 m/s
• Is sound a form of electromagnetic radiation?

7
Electromagnetic Waves
• Properties of waves include speed, frequency and
wavelength
• All electromagnetic waves including light travel
at a speed of 3 x 108 m/s.

8
Wavelength (?)
Measured in units of length m, nm, A
º
9
Frequency (?)
Measured in cycles/second hertz (Hz)
10
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11
Visible Light
12
• For all waves ? ? c
• c the speed of light 3.00 x 108 m/s

13
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
14
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
• 665 nm 665 x 10-9 m

15
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
• 665 nm 665 x 10-9 m
• c ? ?

16
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m

17
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz

18
A photon of red light has a wavelength of 665 nm.
What is the frequency of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz
• ? 4.51 x 1014/s or Hz

19
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
20
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
• 7.25 x 1020 Hz 7.25 x 1020/s

21
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
• 7.25 x 1020 Hz 7.25 x 1020/s
• c ? ?

22
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
• 7.25 x 1020 Hz 7.25 x 1020/s
• c ? ?
• ? c ? 3.00 x 108 m/s 7.25 x 1020/s

23
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
• 7.25 x 1020 Hz 7.25 x 1020/s
• c ? ?
• ? c ? 3.00 x 108 m/s 7.25 x 1020/s
• ? 4.137931 x 10-13 m

24
An x-ray has a frequency of 7.25 x 1020 Hz. What
is the wavelength?
• 7.25 x 1020 Hz 7.25 x 1020/s
• c ? ?
• ? c ? 3.00 x 108 m/s 7.25 x 1020/s
• ? 4.137931 x 10-13 m
• ? 4.14 x 10-13 m

25
Energy of Waves
26
• For all waves E h ?
• h 6.63 x 10-34 J s or J/Hz

27
A photon of red light has a wavelength of 665 nm.
What is the energy of this light?
28
A photon of red light has a wavelength of 665 nm.
What is the energy of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz
• ? 4.51 x 1014/s or Hz

29
A photon of red light has a wavelength of 665 nm.
What is the energy of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz
• ? 4.51 x 1014/s or Hz
• E h ? (6.63 x 10-34 J s)(4.51 x 1014/s)

30
A photon of red light has a wavelength of 665 nm.
What is the energy of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz
• ? 4.51 x 1014/s or Hz
• E h ? (6.63 x 10-34 J s)(4.51 x 1014/s)
• E 2.99013 x 10-19 J

31
A photon of red light has a wavelength of 665 nm.
What is the energy of this light?
• 665 nm 665 x 10-9 m
• c ? ?
• ? c ? 3.00 x 108 m/s 665 x 10-9 m
• ? 4.511278 x 1014/s or Hz
• ? 4.51 x 1014/s or Hz
• E h ? (6.63 x 10-34 J s)(4.51 x 1014/s)
• E 2.99013 x 10-19 J 2.99 x 10-19 J

32
An x-ray has a frequency of 7.25 x 1020 Hz. What
is its energy?
33
An x-ray has a frequency of 7.25 x 1020 Hz. What
is its energy?
• E h ? (6.63 x 10-34 J/Hz)(7.25 x 1020Hz)

34
An x-ray has a frequency of 7.25 x 1020 Hz. What
is its energy?
• E h ? (6.63 x 10-34 J/Hz)(7.25 x 1020Hz)
• E 4.80675 x 10-13 J

35
An x-ray has a frequency of 7.25 x 1020 Hz. What
is its energy?
• E h ? (6.63 x 10-34 J/Hz)(7.25 x 1020Hz)
• E 4.80675 x 10-13 J
• E 4.81 x 10-13 J

36
wavelength, frequency and energy
Red Light
• ? 665 x 10-9 m
• ? 4.51 x 1014 Hz
• E 2.99 x 10-19 J
• ? 4.14 x 10-13 m
• ? 7.25 x 1020 Hz
• E 4.81 x 10-13 J

X-ray
37
Wavelength, frequency and energy
• Wavelength and frequency have an indirect
relationship.
• Energy and frequency have a direct relationship.
• Electromagnetic radiation with a shorter
wavelength will have a higher frequency and
higher energy.
• Electromagnetic radiation with a longer
wavelength will have a lower frequency and lower
energy.

38
Homework
• Chapter 4 Worksheet 2 (due in two days)