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Physics, Science
9th -
12thgrade
3 Light Intensity: Inverse Square Law
12 questions
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- 1. Multiple Choice
The TIME it takes light from the Sun to reaches us is: Distance = 93,000,000 miles 'c' = 186,000 mi / sec
2 minutes and 8 seconds (128 seconds)
4 minutes and 10 seconds (250 seconds)
8 minutes and 20 seconds (500 seconds)
10 minutes and 20 seconds (620 seconds)
- 2. Multiple Choice
Why does light refract when it travels through a medium with a different refractive index?
It changes its speed entering the new medium
It is reflected away from the material
Light gets absorbed
Light is absorbed and reflected leading to refraction
- 3. Multiple Choice
Light traveling through WHICH of the following will travel the SLOWEST?
'c' in substance = 'c' in vacuum / refractive indexVacuum (of space)
Air
Diamond
Glass
- 4. Multiple Choice
Light Intensity: As one gets further from a light source, the intensity of light....
Increases
Decreases
Gets brighter
Gets more luminous
- 5. Multiple Choice
As one approaches (gets closer) to a light bulb, the brightness of the bulb....
Increases (brighter)
Decreases
Stays the same
Changes in some unknown way
- 6. Multiple Choice
Earth's Sun is 93 million miles from Earth. Mercury is closest and Neptune is the furthest planet. Which one experiences the greatest intensity of light energy?
(*of the 3 given)
Mercury
Earth
Neptune
All 3 receive the same sunlight intensity (it's the Sun)
- 7. Multiple Choice
A student stands 10 feet away from a light bulb. The student walks toward the light bulb to a 5 feet distance. Which is true? Intensity = 1 / d2
The bulb appears 2x's brighter
The bulb appears 4x's brighter
The bulb appears 5x's brighter
The bulb appears 25x's brighter
- 8. Multiple Choice
At a distance of 1m, the intensity of light is spread over a 1m x 1m area. What is the area of light spread out at distance 2m?
1 m2
2 m2
4 m2
8 m2
- 9. Multiple Choice
Based on the picture...what is the RATE of change of light intensity as one moves FURTHER from the light source?
Light intensity INCREASES at an inverse square
Light intensity INCREASES as a direct relationship
Light intensity DECREASES at an inverse square
Light intensity INCREASES as a direct relationship
- 10. Multiple Choice
SOLVE: A light bulb has an intensity of 50 watts at a distance of 1 meter. What is the intensity of the light at 5 meters? Intensity = 1 / d2
1 watt
2 watts
5 watts
10 watts
- 11. Multiple Choice
SOLVE: An iPhone light shines at 40 watts from 6 meters away. What is the intensity of light at 2 meters away?
120 watts
160 watts
360 watts
720 watts
- 12. Multiple Choice
SOLVE: An iPhone light shines at 40 watts from 6 meters away. What is the intensity of light at 12 meters away?
80 watts
20 watts
15 watts
10 watts
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