Download Name: Score: Regents Physics Worksheet 5.2.1 – EM Spectrum (20

20
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Regents Physics
Worksheet 5.2.1 – EM Spectrum (20 points)
Show all work – multiple choice answers MUST be proven for full credit!
1.
An electromagnetic wave traveling through outer space
-9
has a wavelength of 5.0 x 10 meter.
a.
3.
A light ray passes through the four different media listed
below. Rank the media from fastest to slowest.
A.
B.
C.
D.
What is the speed of this wave?
______________________ m/s
b.
corn oil
ethyl alcohol
water
flint glass
Determine the frequency of this wave
_____,_____,_____,_____
4.
Photon
A
B
C
D
[6.0 x 1016 Hz]
c.
In what part of the electromagnetic spectrum is
this wave found?
____________________
2.
Frequency (Hz)
19
1.00 x 10
16
3.00 x 10
14
5.26 x 10
13
2.00 x 10
6.63 x 10
a.
14
Energy (J)
-15
6.63 x 10
-17
1.99 x 10
-19
3.49 x 10
-20
1.33 x 10
-26
E
An 6.2 x 10 hertz electromagnetic wave is passing
through unknown substance that has an index of
refraction of 2.4
a.
The table below shows the relationship between the
energy of a set of photons and their frequency.
8
1.00 x 10
In which part of the electromagnetic spectrum
would each of the photons be found?
A __________________
Determine the speed of the wave in this
medium.
B __________________
C __________________
D __________________
E __________________
b.
Which photon has the shortest wavelength?
[1.25 x 108 m/s]
b.
Calculate the wavelength of this wave in this
medium.
5.
Sketch a graph that correctly relates the speed of an EM
wave in a medium to the index of refraction for that
medium.
n
[2.0 x 10-7 m]
v
6.
An electromagnetic wave traveling through a vacuum has
-1
a wavelength of 1.5 x 10 meter. What is the period of
this electromagnetic wave?
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(1) 5.0 x 10 s
-1
(2) 1.5 x 10 s
7
(3) 4.5 x 10 s
9
(4) 2.0 x 10 s
10. Electromagnetic radiation with a wavelength of 1.3 x 10
meter is classified as
(1) infrared
(2) orange
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(3) blue
(4) ultraviolet
Proof: Find frequency then use EM Spectrum chart – can’t just go by λ!
Proof: Show calculations.
7.
Which is closest to the difference between the order of
magnitude for the frequencies of AM radio waves and FM
radio waves?
(1) 2
(2) 6
(3) 7
Base your answer to question 6 on the diagram below which shows
an antenna emitting an electromagnetic wave.
(4) 8
Proof: Explain / show calculations.
8.
A microwave and an x-ray are traveling in a vacuum.
Compared to the wavelength of the microwave, the x-ray
has a wavelength that is
(1)
(2)
(3)
(4)
longer and a period that is shorter
longer and a period that is longer
shorter and a period that is longer
shorter and a period that is shorter
Proof: Explain using EM Spectrum Chart and/or sample calculations.
9.
Which wavelength is in the infrared range of the
electromagnetic spectrum?
(1) 100 nm
(2) 100 mm
(3) 100 m
(4) 100 µm
Proof: Convert ALL to meters then find power of 10 for each.
11. The electrons in the antenna produce the electromagnetic
wave by
(1)
(2)
(3)
(4)
remaining stationary.
moving at constant speed upward only.
moving at constant speed downward only.
accelerating alternately upward and downward.
Proof: Explain your reasoning.
12. Which characteristic is the same for every color of light in
a vacuum?
(1) energy
(2) speed
Proof: Explain your reasoning.
(3) period
(4) frequency