作业帮物理 critical thinking
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物理 critical thinking
How bright would the sun appear to an observer on Earth if the sun were four times farther from Earth than it actually is?
Express your answer as a fraction of the sun’s brightness on Earth’s surface.
How bright would the sun appear to an observer on Earth if the sun were four times farther from Earth than it actually is?
Express your answer as a fraction of the sun’s brightness on Earth’s surface.
Let the sun’s brightness on Earth’s surface be I,
The brightness the sun appears to be if the sun were four times farther from Earth will be （1/16）I.
根据：
The intensity (or illuminance or irradiance) of light or other linear waves radiating from a point source (energy per unit of area perpendicular to the source) is inversely proportional to the square of the distance from the source; so an object (of the same size) twice as far away,receives only one-quarter the energy (in the same time period).
The brightness the sun appears to be if the sun were four times farther from Earth will be （1/16）I.
根据：
The intensity (or illuminance or irradiance) of light or other linear waves radiating from a point source (energy per unit of area perpendicular to the source) is inversely proportional to the square of the distance from the source; so an object (of the same size) twice as far away,receives only one-quarter the energy (in the same time period).
物理 critical thinking
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