Name:__________________Hour:
LIGHT WORKSHEET #1
Solve the following problems on a separate sheet of paper.
1.
(a) Write the mathematical equation showing the relationship between wavelength
and frequency for an electromagnetic wave. (b) Indicate how the variables are
related to one another.
2.
(a) Write the mathematical equation showing the relationship between energy and
frequency for an electromagnetic wave (b) Indicate how the variables are related to
one another.
3.
Indicate how the variables wavelength and energy are related to one another for an
electromagnetic wave.
4. The wave below is NOT an electromagnetic wave so we don’t know for certain it goes
at the speed of light! You can’t use the equations, These questions are testing your
understanding of the definitions of wavelength and frequency and you must use the
information given in the question and the picture to figure them out.
(a) Use the diagram below and the definition of wavelength to find the wavelength of
the wave. (b) Use the definition of frequency and assume the entire wave below
traveled for 0.017 seconds to find the frequency. (c) Use the wavelength and
frequency to find the velocity in m/sec.
5.24 m
5.
Given an electromagnetic wavelength of 5.7 X 10-5 m/cyc, calculate the (a) frequency
and (b) energy of this wave.
4.0
4.4
4.9
5.5
5.8
6.3
7.0
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-7
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| violet |
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blue
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(  in m X 10 )
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green
|yellow|
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orange
red
6.
The frequency of a light wave equals 6.0 X 1014 cyc/sec. Calculate the (a) wavelength
(b) color and (c) energy.
7.
Given light energy of 3.2 X 10-12 erg (1erg = 1 x10-7 J), calculate the (a) frequency (b)
wavelength and (c) color.
8.
The-7energy of a certain type of electromagnetic radiation is 1.88 X 10-16 erg (1erg = 1
x10 J). Calculate the (a) frequency (b) wavelength and (c) type of radiation that has
this energy.
-13
10
-11
-9
10
-7
10
-5
10
-3
10
-1
10
10
1
10
( in m)
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Gamma
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radiation |
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9.
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X-rays |
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Ultra
Violet
light
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| |
|V|
|i|
|s|
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Infrared
light
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Micro
waves
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| TV & radio
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signals
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The energy of some electromagnetic wave equals 2.9 X 10-8 erg (1erg = 1 x10-7 J).
Calculate the (a) frequency (b) wavelength and (c) type of radiation of this wave.
10. When the soprano hits high C in the mad scene of the opera “Lucia di Lammermoor”,
there is an appreciative sigh throughout the audience. High C on the musical scale has
a frequency of 1024 cyc/sec. Find the wavelength in of the high C sound wave. (The
velocity of a sound wave is equal to 331 meters/sec. DO NOT USE c FOR THE
VELOCITY….this is a sound wave, not light.)
11. How long (in sec) would it take a radio signal wave
to travel from the Earth to the
planet Mars, a distance of approximately 8.0 X 107 km? (Remember that a radio
signal is a form of electromagnetic radiation. Use c for the velocity. Use dimensional
analysis. Convert the km to cm and then use c as a conversion factor.
12. Joan is wearing a blue shirt, Sheila is wearing a green shirt and Roslyn is wearing a
red shirt. Which girl is wearing the shirt that is giving off the most energy in terms of
light energy being reflected? Use the color chart to justify your answer.
13. Given an electromagnetic radiation energy value of 5.6 x 10-13 erg (1erg = 1 x10-7 J),
find the (a) frequency, (b) wavelength and (c) type of radiation associated with this
value.
14. Given a light of frequency of 5.35 x 1014 cyc/sec, find the (a) wavelength, (b) color
and (c) energy associated with this value.