Physics Assignment | Online Assignment

Physics 30 Unit 4 Quiz on EMR
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. Use the following information to answer the next question.
The paragraph below contains a factual error.
Electromagnetic radiation consists of a wide range of frequencies. However, different frequencies and wavelengths are measured in different media. The speed of all frequencies of electromagnetic radiation is the same in a vacuum, but differs in different media. Electromagnetic waves are transverse waves and can be polarized.
Which statement below identifies the factual error in the paragraph?
a.
Electromagnetic waves are transverse waves and can be polarized.
b.
Different frequencies and wavelengths are measured in different media.
c.
Electromagnetic radiation consists of a wide range of frequencies.
d.
The speed of all frequencies of electromagnetic radiation is the same in a vacuum but differs in different media.
____ 2. Roemer gathered data to measure the speed of light by observing
a.
light travelling between lantern flashes on distant hills.
b.
light radiating from the Sun to Earth.
c.
light from a source, reflecting from rotating octagonal mirrors to an observer.
d.
light reflected from Jupiter’s moon Io to Earth.
____ 3. Michelson’s rotating mirrors are used to determine the speed of light. The mirrors are rotating at 625 revolutions per minute. Light strikes mirror X, reflects to the plane mirror, and then strikes mirror Z, which reflects light to the observer. During that time, mirror X will have moved to the position of mirror Y. Determine the total distance that the light travelled.
a.
3.60
103 km
c.
6.00
101 km
b.
6.00
104 km
d.
3.60
106 km
____ 4. If a 3.00-cm-tall object is placed 15.0 cm in front of a concave mirror with a centre of curvature of 25.0 cm, then the height of the image is
a.
1.88 cm
c.
7.50 cm
b.
15.0 cm
d.
0.600 cm
____ 5. A concave mirror with a focal length of 20.0 cm is used to observe the image of a 1.75-cm candle that is placed 15.0 cm from the mirror. The image is
a.
inverted, 0.438 cm tall, and located 60.0 cm from the mirror.
b.
inverted, 7.00 cm tall, and located 60.0 cm from the mirror.
c.
impossible to see.
d.
erect, 7.00 cm tall, and located 60.0 cm from the mirror.
____ 6. A student uses an optical bench and places a burning candle with a 1.00-cm-high flame at a distance of 20.0 cm from a convex mirror with a focal length of 15.0 cm. The image is
a.
virtual, erect, and smaller.
c.
virtual, erect, and larger.
b.
real, inverted, and smaller.
d.
real, erect, and larger.
____ 7. Use the following information to answer the next question.
I
Frequency increases.
II
Frequency decreases.
III
Frequency stays the same.
IV
Wavelength increases.
V
Wavelength decreases.
VI
Wavelength stays the same.
VII
Speed increases.
VIII
Speed decreases.
IX
Speed stays the same.
X
Total internal reflection is possible.
XI
Total internal reflection is not possible.
When light goes from air into water, the true statements above are
a.
II, V, VII, and XI
c.
I, IV, VII, and X
b.
III, VI, IX, and X
d.
III, V, VIII, and XI
____ 8. When light in air meets the boundary with water,
a.
all of the light reflects.
b.
all of the light first refracts and then reflects.
c.
all of the light refracts.
d.
some light reflects and some refracts.
____ 9. Frequency is more reliable than wavelength for classifying colours of light because wavelength changes during
a.
refraction.
c.
polarization.
b.
interference.
d.
diffraction.
____ 10. The refractive index of water is 1.33. For a certain composition of glass, the refractive index is 1.52. If a ray of light travels from water into glass with an incident angle of 40.0, the angle of refraction in the glass is
a.
25.0
c.
34.2
b.
47.3
d.
28.9
____ 11. A student traces the light refraction pattern of light in air and as it passes into glass and records the following data.
From these data, the speed of light in the glass is
a.
3.44
108 m/s
c.
1.92
108 m/s
b.
2.00
108 m/s
d.
2.17
108 m/s
____ 12. Total internal reflection has important applications in fibre optic surgery. A long, narrow optical fibre is used in microsurgery for lessening trauma and the chance of infection, and for reducing the healing period. Light within an optical fibre undergoes total internal reflection hundreds of thousands of times without escaping. The critical angle at the glass-air interface (nglass = 1.55, nair = 1.00) is
a.
40.2
c.
33.7
b.
56.3
d.
48.2
____ 13. A light ray is incident at 35.0 on an equilateral triangle composed of a glass with an index of refraction of 1.49.
The angle of refraction as the ray exits the glass is
a.
37.4
c.
64.8
b.
22.6
d.
35.0
____ 14. A 5.00-cm-tall object is placed 10.0 cm from a concave lens. The image is one-fifth the size of the object. The lens has a focal length of
a.
0.600 cm
c.
–0.400 cm
b.
1.67 cm
d.
–2.50 cm
____ 15. A diffraction grating with 4.50
103 lines/cm produces a second-order bright line 25.0 from the central maximum. The wavelength of the incident light is
a.
2.13
106 m
c.
4.70
10–7 m
b.
1.06
106 m
d.
9.39
10–7 m
____ 16. When performing an experiment similar to Young’s double-slit experiment, a student observes that the distance between antinodes triples. The most likely change that the student made in order to observe this effect is that he
a.
decreased the wavelength of the light to one-third the original.
b.
decreased the intensity of the light to one-third the original.
c.
decreased the distance between the slits to one-third the original.
d.
decreased the distance from the slits to the screen to one-third the original.
____ 17. If the angle of deviation from the central maximum to the first antinodal line increased from its original position, it is most likely because the
a.
slits were spaced farther apart.
b.
screen was moved closer to the slits.
c.
slits were moved closed together.
d.
the wavelength of light was shortened.
____ 18. Polarization of light can best be explained by considering light to behave as a
a.
quantum.
c.
longitudinal wave.
b.
transverse wave.
d.
photon.
Numeric Response
19. Types of electromagnetic radiation have the characteristics listed below.
1.
emitted by warm bodies
2.
vibrate water molecules
3.
penetrate and ionize matter
4.
associated with nuclear power
Types of electromagnetic radiation:
a.
X rays
b.
infrared rays
c.
microwaves
d.
gamma rays
Match each of the above types of electromagnetic radiation, a, b, c, and d, with the numbered description that best matches it. Use each number only once. (Record all four digits of your answer.)
_______ _______ _______ _______
a b c d
20. Place the following types of electromagnetic radiation in order of decreasing energy. (Record all four digits of your answer.)
1
red light
2
infrared radiation
3
ultraviolet light
4
gamma radiation
________ _________ ________ _______
21. A radar beam is directed toward a cliff face. A time of 3.0
10–4 s passes from the instant the beam is sent and returns to the detector. The distance from the radar to the cliff face is ________ km. (Record your three-digit answer.)
22. If monochromatic red light in a vacuum has a wavelength of 6.25
10–7 m, its period, expressed in scientific notation, is a.b
10–cd s. The values of a, b, c, and d are ______, ______, ______, and ______. (Record all four digits of your answer.)
23. Use the following information to answer the next question.
A ray of light has an incident angle of 63.0 on mirror A. This mirror is placed so that it and a second mirror, B, form an angle of 97.0. The calculated value of the angle of reflection from mirror B is _________. (Record your three-digit answer.)
24. A convex lens magnifies an object 2.50 times when the object is placed 10.0 cm from the front of the lens. The focal length of the lens is _________ cm. (Record your three-digit answer.)
25. Light with a wavelength of 3.95  10-7 m passes through a diffraction grating with 5.10
105 lines/m. The grating is located 75.0 cm from a screen. The angle at which the first-order image is formed, as measured from the central maximum, is ______. (Record your three-digit answer.)