Higher Carbon Dizode levels than we have now were last seen about
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2 million years ago
Submarines can be detected by their
,Give this one a try later!
magnetism
A tungsten lightbulb has 100 watts printed on it. About how much power is actually
emitted as visible light?
A. 16 watts B. 40 watts C. 100 watts D. 220 watts
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A. 16 watts
To be affordable without subsidy or carbon credit the cost of billion-watt solar plant
must be not much more than
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1 billion
Edison wanted
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a power plant on every city block
,Stress in plastic can be detected by looking at
A. the transmission of different colors
B. the reflection of different colors
C. interference
D. polarized light (crossed polaroids)
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D. polarized light (crossed polaroids)
To have sound channel, there must be
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a minimum in teh velocity of sound
The average temperature of the Earth is now about
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57 F
In the pinhole camera, more blurring occurs if
A.the hole is made very large (but not if it is very small)
B. the hole is made very small (but not if it is made very large)
C. the hole is either very large or very small
D. Never, since there is no lens in a pinhole camera
, Give this one a try later!
A. the hole is made very large (but not if it is very small)
On a typical day, sound emitted near the ground tends to bend
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upwards, towards the sky
Ozone depletion is caused by (choose all that are correct)
A. CFCs B. carbon dioxide C. fossil fuels D. cosmic rays
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A. CFCs
A "heat-seeking" missile actually aims itself toward
A. infrared light B. ultraviolet light C. visible light D. radio waves
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A. infrared light
The speed of sound in the air
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2 million years ago
Submarines can be detected by their
,Give this one a try later!
magnetism
A tungsten lightbulb has 100 watts printed on it. About how much power is actually
emitted as visible light?
A. 16 watts B. 40 watts C. 100 watts D. 220 watts
Give this one a try later!
A. 16 watts
To be affordable without subsidy or carbon credit the cost of billion-watt solar plant
must be not much more than
Give this one a try later!
1 billion
Edison wanted
Give this one a try later!
a power plant on every city block
,Stress in plastic can be detected by looking at
A. the transmission of different colors
B. the reflection of different colors
C. interference
D. polarized light (crossed polaroids)
Give this one a try later!
D. polarized light (crossed polaroids)
To have sound channel, there must be
Give this one a try later!
a minimum in teh velocity of sound
The average temperature of the Earth is now about
Give this one a try later!
57 F
In the pinhole camera, more blurring occurs if
A.the hole is made very large (but not if it is very small)
B. the hole is made very small (but not if it is made very large)
C. the hole is either very large or very small
D. Never, since there is no lens in a pinhole camera
, Give this one a try later!
A. the hole is made very large (but not if it is very small)
On a typical day, sound emitted near the ground tends to bend
Give this one a try later!
upwards, towards the sky
Ozone depletion is caused by (choose all that are correct)
A. CFCs B. carbon dioxide C. fossil fuels D. cosmic rays
Give this one a try later!
A. CFCs
A "heat-seeking" missile actually aims itself toward
A. infrared light B. ultraviolet light C. visible light D. radio waves
Give this one a try later!
A. infrared light
The speed of sound in the air
