SCIH 023 PPAOC Electromagnetic Waves & Static Electric Charge Question

Name
_________________________________
I.D. Number
_______________________
Unit 3 Evaluation
Evaluation 03
Physical Science 1
SCIH 023 055
This evaluation will cover the lessons in this unit. It is open book, meaning you can use your
textbook, syllabus, and other course materials. You will need to understand, analyze, and apply the
information you have learned in order to answer the questions correctly. To submit the evaluation by
mail, follow the directions on your Enrollment Information Sheet. To take the evaluation online,
access the online version of your course; use the navigation panel to access the prep page for this
evaluation and follow the directions provided.
Part A: Matching
Match each term with its correct definition.
a. nearsighted
b. pupil
c. cornea
d. cones
e. farsighted
_____
1. the vision you have when the light entering your eye is focused in front of your retina
_____
2. the transparent covering on your eye that causes light rays to bend and converge
_____
3. the part of your eye that absorbs red, blue and green light
_____
4. being able to see distant images clearly but having difficulty in creating a clear focus of
close-up objects
_____
5. the part of your eye that adjusts the amount of light that enters your eye
Part B: Multiple Choice
Select the response that best completes the statement or answers the question.
_____
6. Which of type of waves can travel without a medium?
a.
b.
c.
d.
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sound
radio
mechanical
transverse
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_____
7. The type of waves that pass through a coiled metal spring are called
a.
b.
c.
d.
_____
transverse waves.
electromagnetic waves.
longitudinal waves.
seismic waves.
8. The average speed of sound in water is approximately 1,500 m/s. If the noise from a
boat takes 5.0 seconds to reach an underwater detector, how far away is the boat?
(d/s = t)
a.
b.
c.
d.
_____
0.0033 m
300 m
1,505 m
7,500 m
9. Which of the following produces electromagnetic waves?
a.
b.
c.
d.
direct current
vibrating electric charge
static electric charge
constant electric field
_____ 10. The speed of electromagnetic waves is
a.
b.
c.
d.
different for each frequency in a vacuum.
less in a vacuum than in water.
300,000 km/s in a vacuum.
faster than the speed of light in a vacuum.
_____ 11. Electromagnetic waves
a.
b.
c.
d.
are longitudinal waves.
are transverse waves.
must travel through a medium.
do not interact with matter.
_____ 12. If you hear a musical sound from an instrument that is vibrating the air at 200.0 Hz and
traveling at 340 m/s, what is the wavelength of that music? (Hint: use the wave speed
equation: v =f λ )
a.
b.
c.
d.
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1.7 m
0.59 m
68,000 m
0.0050 m
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_____ 13. When the crest of one wave passes through the trough of another wave, what takes
place?
a.
b.
c.
d.
resonance
constructive interference
destructive interference
diffraction
_____ 14. To what is the size of the disturbance from a wave related?
a.
b.
c.
d.
frequency
wave speed
amplitude
refraction
_____ 15. The number of wavelengths that pass a fixed point each second is the _______ of
those waves.
a.
b.
c.
d.
frequency
period
wavelength
amplitude
_____ 16. When light strikes an object and bounces off its smooth surface it is called a
a.
b.
c.
d.
refraction.
regular reflection.
diffuse reflection.
mirage.
_____ 17. The wavelength of purple light is _____ that of yellow light.
a. the same as
b. longer than
c. shorter than
_____ 18. Which part of the electromagnetic spectrum is usually used for communication?
a.
b.
c.
d.
radio waves
infrared waves
ultraviolet waves
gamma rays
_____ 19. In order for you to see a yellow chair, what wavelength(s) of light reflected from the
yellow chair does your eye perceive?
a.
b.
c.
d.
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red
green
yellow
red and green light
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_____ 20. If light waves change speed when they pass from one medium into another, the light
will be
a.
b.
c.
d.
diffused.
reflected.
refracted.
translucent.
_____ 21. The primary light colors are
a.
b.
c.
d.
magenta, cyan and yellow.
red, blue, and green.
yellow, blue, and green.
red, yellow, and cyan.
_____ 22. Which type of light uses phosphors to convert ultraviolet radiation to visible light?
a.
b.
c.
d.
incandescent light
fluorescent light
neon light
laser light
_____ 23. Which is the purpose of resonance in musical instruments?
a.
b.
c.
d.
to increase the pitch
to amplify the sound
to decrease the pitch
to create overtones
_____ 24. If you pass by a building with a siren sounding, as you move away from the building,
the sound of the sirens will be
a. higher-pitched.
b. lower-pitched.
c. the same.
_____ 25. Seeing an image in a mirror is a function of what behavior of light?
a.
b.
c.
d.
refraction
diffraction
reflection
resonance
_____ 26. When a wave bends around an object it encounters it is called
a.
b.
c.
d.
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interference.
diffraction.
reflection.
refraction.
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_____ 27. Musicians use the concept of resonance in sound waves. What causes resonance?
a. Resonance is the vibration of waves that take place when the angle of incidence
matches the angle of reflection.
b. The resonance of waves takes place when nodes do not align.
c. Resonance takes place when an object vibrates by absorbing energy at its natural
frequencies.
d. Destructive interference causes resonance.
_____ 28. The decibel scale measures
a.
b.
c.
d.
sound intensity.
the number of rarefactions in sound.
the Doppler effect.
pitch intensity.
_____ 29. Humans can generally hear sounds with frequencies ranging from 20.0 to 20,000 Hz.
This means that
a.
b.
c.
d.
humans have no difficulty hearing sounds in this range.
humans have difficulty hearing high-pitched sounds above 20,000 Hz.
humans have difficulty hearing low-pitched sounds below 20.0 Hz.
all of these statements about human hearing are true.
_____ 30. What determines the pitch of the sound produced in wind and brass instruments?
a.
b.
c.
d.
the length of the vibrating tube of air in the instrument
how tightly the membrane is fastened across the resonator
the tightness of the strings
the shape of the resonator
_____ 31. Which of the following types of containers would allow you to clearly see if there were
ice cubes inside?
a.
b.
c.
d.
opaque
translucent
transparent
incandescent
_____ 32. Which of the following colors is bent the least as it exits a prism?
a.
b.
c.
d.
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blue
yellow
green
red
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_____ 33. What is the main cause of mirages?
a. Light diffracts through the opening in human eyes.
b. Light waves are refracted as they pass through air of different densities.
c. The normally diffuse scattering of light becomes focused due to the index of
refraction of the medium.
d. The temperature changes in the layers of air cause the light to bend around edges
of the actual object.
_____ 34. In which type of mirror do the reflected images look farther away than they actually
are?
a. plane
b. concave
c. convex
_____ 35. Which part of the human eye contains light-sensitive cells that convert an image into
electrical signals?
a.
b.
c.
d.
cornea
retina
lens
pupil
_____ 36. Which of the following describes the chief reason for color blindness?
a.
b.
c.
d.
The cones in the retina are not functioning properly.
The lens of the eye is too convex.
The rods in the retina are not functioning properly.
The distance between the lens and retina is too short.
_____ 37. Which of the following lists of electromagnetic waves is in the correct order from lowest
to highest frequency?
a.
b.
c.
d.
microwaves, visible light, radio waves
microwaves, radio waves, visible light
visible light, radio waves, microwaves
radio waves, microwaves, visible light
_____ 38. What type of waves does a remote control device use to communicate with a television
set?
a.
b.
c.
d.
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microwaves
radio waves
carrier waves
infrared waves
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_____ 39. Which type of electromagnetic waves are used by your body to produce vitamin D?
a.
b.
c.
d.
infrared waves
ultraviolet waves
microwaves
visible light rays
_____ 40. Ozone in Earth’s upper atmosphere is most helpful in absorbing potentially damaging
a.
b.
c.
d.
ultraviolet waves.
infrared waves.
microwaves.
gamma rays.
_____ 41. Which of the following is true for AM radio waves?
a. The typical frequency range is in the 100 million Hertz range.
b. Their changing amplitudes produce changes in the electrical field of your radio
antenna.
c. The amplitude of the carrier waves is altered as the station broadcasts.
d. AM radio waves tend to provide a clearer signal than FM carrier waves.
_____ 42. According to your textbook, how many satellites have been launched into orbit around
the Earth?
a.
b.
c.
d.
10 to 50
50 to 200
200 to 1,000
over 1,000
Part C: True or False
Choose whether each of the following statements is True or False.
_____ 43. Sound waves do not carry energy.
a. True
b. False
_____ 44. Refraction occurs when a wave strikes an object and bounces off, moving in another
direction.
a. True
b. False
_____ 45. The angle at which light strikes a surface is the same as the angle at which it is
reflected.
a. True
b. False
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_____ 46. A three-dimensional photographic image of an object is a hologram.
a. True
b. False
_____ 47. Both a convex lens and a concave mirror cause light rays to converge and form
different types of images, depending on the position of the object relative to the focal
point.
a. True
b. False
_____ 48. Mechanical waves need matter to travel through and they are only transverse waves.
a. True
b. False
_____ 49. A process called convergence is when two or more waves overlap and combine to
form a new wave.
a. True
b. False
_____ 50. A wave’s velocity can be calculated by dividing its frequency by its wavelength.
a. True
b. False
Carefully check your answers on this evaluation and make any corrections you feel are
necessary. When you are satisfied that you have answered the questions to the best of your
ability, transfer your answers to an answer sheet. Please refer to the information sheet that
came with your course materials.
Unit 3 Evaluation
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