Reference no: EM131178518
1. An electric motor accomplishes what task?
converts chemical energy into mechanical energy
converts electrical energy into electromagnetic energy
converts electrical energy into mechanical energy
converts mechanical energy into chemical energy
converts mechanical energy into electrical energy
The next five questions refer to these electric meters:
2. How much electricity was used during the month of June?
2813 kwh
2582 kwh
3011 kwh
2903 kwh
2744 kwh
3. How much would this energy cost the consumer? (assume the average rate of $0.07 per kwh)
$203.00
$210.77
$196.91
$188.90
$176.43
4. What was the meter reading on June 1?
59,301
58,300
58,410
69,411
58,310
5. What was the meter reading on July 1?
61,134
61,132
61,234
61,123
61,223
6. A piece of iron can be made into a permanent magnet by stroking it with a strong magnet.
true
false
7. If the frequency of a wave is 5 Hz, how many waves will pass by a stationary object in 1 minute?
1/5
5
300
60
1/300
8. A submarine captain wishes to know how far away an undersea cliff face is, so he sends out a SONAR signal. After 0.80 seconds, he receives the echo. How far away is the cliff face?
1500 m
1200 m
600 m
3000 m
2400 m
Use this figure to answer the next 3 questions:
9. On the diagram, which letter represents the amplitude?
A
B
C
D
E
10. Which of the letters represents the wavelength?
A
B
C
D
E
11. Which position represents the trough?
A
B
C
D
E
12. If a star is moving away from Earth at a high speed, which of the following would astronomers observe?
The star's spectrum would not be shifted at all.
The star's spectrum would be shifted towards red.
The star's spectrum would be shifted towards blue.
There is not enough information given to determine.
13. The visible spectrum is made of what types of light?
red, orange, yellow, green, blue, violet
infrared, red, orange, green, blue, ultraviolet
red, orange, yellow, green, blue, ultraviolet
radio, infrared, colored light, ultraviolet, x-rays, gamma rays
14. Which of the following has the most energy?
x-rays
ultraviolet
visible light
gamma rays
infrared
15. Which of the following best describes the dual nature of light?
Light can be thought of as visible colors or as invisible colors.
Light can be thought of as being white light or a combination of colored light.
Light can be thought of as a mixture of colored light or a mixture of pigments.
Light can be thought of as behaving like a particle or like a wave.
16. What advantage does knowing about the atomic spectrum give astronomers?
It helps them predict solar and lunar eclipses.
It helps them determine what elements make up stars.
It helps them determine the age of the universe.
It helps them know what the planets are made of.
17. Which of the following has the longest wavelength?
infrared
visible light
gamma rays
x-rays
ultraviolet
18. Which of the following scientists did not attempt to calculate the speed of light?
Michelson
Huygens
Galileo
Einstein
19. Which of the following characteristics of an object would allow no light to pass through?
horizontal polarization
opaqueness
transparency
translucency
transmutaticity
20. The "speed of light" (c) refers to the speed of all electromagnetic waves under what conditions?
through the interstellar ether
through a clear liquid, like water
through a perfect vacuum
through the earth's atmosphere
The speed of light is the same under any conditions.