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1. Radio telescopes beam radio waves into space. To calculate the speed of the radio waves in space, which additional piece of information, if any,
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Question

information, if any, is necessary? (1 point)
The strengths of the electric and magnetic fields.
O The frequency of the radio waves.
O The wavelength of the radio waves.
O None (the speed is a known constant).
2. As explained by the theory of quantum electrodynamics, light is best described as
(1 point)
Both a wave and particles.
O Particles, not a wave.
O A wave, not particles.
3. A physicist is investigating a beam of laser light of wavelength 550 nm. The light strikes a target that is 189 meters away
from the source of the light. What is the travel time of the light from the source to the target? Let the speed of light c =
3.00 x 10^8 m/s. (1 point)
4.23 x 10-7 s
6.30 x 10^-7s
1.83 x 10^-6s
O 3.47 x 10^-45
4. Match the following types of electromagnetic waves with where they exist on the electromagnetic spectrum. (2 points)
Visible
1.
Microwaves
2
Light
Ultraviolet
3
4.
Higher Wavelength
Lower Wavelength
Lower Frequency
Higher Frequency
1
a. Gamma Rays
b. X-Rays
2
c. Infrared
3
4
5. The differences between microwaves and infrared radiation are due to differences in their
. (1 point)
Speed of travel
Wavelength and frequency
O Means of propagation
O Visibility to the human eye
6. When light passes from air into glass, which of its properties decrease? (1 point)
Speed and frequency
Speed and wavelength
Wavelength and frequency
7. A ray of laser light strikes a glass surface at an angle 0a = 22.50 to the normal. What is the angle Ob of the refracted ray?
Let the index of refraction for glass nb = 1.77. (1 point)
12.50
12.70
31.80
10.10
8. When light passes from a medium to air, how is the critical angle related to the index of refraction of the medium? (1 point)
The critical angle increases as the index of refraction increases.
The critical angle increases as the index of refraction decreases.
The critical angle remains unchanged as the index of refraction increases.
9. The index of refraction of medium 1 is 2.3 and the index of refraction for medium 2 is 1.6. What is the critical angle for light
traveling within medium 1 toward medium 2? (1 point)
O 40
70
O 140
440
10. Based on the data in the graph provided, which value is closest to the index of refraction of quartz for extreme violet light of
wavelength 400 nm? (1 point)
Index of refraction (n)
1.7
Silicate flint glass
1.6
Borate flint glass
Quartz
Silicate crown glass
1.5
Fused quartz
Fluorite
1.4
400
500
600
700
Wavelength in vacuum (nm)
1.53
1.56
1.67
1.44
11. Monochromatic light from a distant source is incident on a slit with a width of 0.750 mm. On a screen 2.00 m away, the
distance from the central maximum of the diffraction pattern to the first minimum is measured to be 1.35 mm. What is the
wavelength of the light? (1 point)
1012 nm
101 nm
506 nm
675 nm
12. Light of wavelength A and frequency 1' passes through a single slit of width a. A diffraction pattern is observed on a screen at
a distance x from the slit. which change will decrease the width of the central maximum? (1 point} C:- Decrease the width of the slit.
C;- Decrease the frequency of the light. C) Decrease the wavelength of the light. 13. A beam of laser light of wavelength 600 nm passes through a thin slit of width 0.00250 mm. The light then forms a
diffraction gradient on a distant screen. what is the smallest angle relative to the original direction of the beam at which
destructive interference occurs? (1 point} (1 point) A 2.4:)0
3-13.90
-A- 36.9“
A 15.00 14. An electromagnetic wave travels through space with velocity:r v. In relation to the direction of v, what are the directions of
the electric ﬁeld E and magnetic ﬁeld B of the wave? (1 point} C- Both E and B are parallel to v
C;- Both E and B are perpendicular to v and they are perpendicular to each other.
C) Both E and B are perpendicular to v and they are parallel to each other. If) E is parallel to v; E is perpendicular to v. 15. Describe the differencefs) between electromagnetic waves and mechanical waves. Provide an example of each in your
descriptions. [2 points)
16. The index of refraction for water at 209 C is 1.333 and the index of refraction for air at 20&quot; C is 1.00293. Find the angle of
refraction for a ray of light that enters a bucket of water from air at an angle of 30.0 to the normal. Show all work and
provide units of measure. (2 points)
17. An electromagnetic wave of frequency 2.30 x 10^14 Hz propagates in carbon tetrachloride with a speed of 2.05 x 10^8
m/s. What is the wavelength of the wave in carbon tetrachloride? Show all work and include units of measure. (2 points)
18. What is the difference between Fresnel Diffraction and Fraunhofer Diffraction? (2 points)
19. A ray in glass arrives at the glass-water interface at an angle of 480 with the normal. The refracted ray, in water, makes a
720 angle with the normal. The index of refraction of water is 1.33. Then the ray in glass is redirected so its new angle of
incidence is 370. What is the new angle of refraction in the water? Show all work. (2 points)
water
n = 1.33
1 720
glass

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