An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
A star's color is directly related to its temperature.
Hotter stars emit blue light, while cooler stars emit red light.
Brightness depends on both temperature and size.
The property of a star most closely related to its temperature is its co l or .
Explanation
Understanding the Question The question asks which property of a star is most closely related to its temperature. The options are brightness, color, composition, and size.
Relating Temperature to Color A star's temperature is directly related to the color it emits. Hotter stars emit blue light, while cooler stars emit red light. This is due to black-body radiation.
Analyzing Other Properties Brightness depends on both temperature and size. Composition is related to the star's formation and evolution, but not as directly to its temperature. Size also influences brightness, but color is the most direct indicator of temperature.
Final Answer Therefore, the property of a star that is most closely related to its temperature is its color.
Examples
Imagine you're heating a metal rod. As it gets hotter, it starts to glow. First, it glows red, then orange, then yellow, and eventually white or even blue at very high temperatures. The color of the rod is a direct indication of its temperature, just like the color of a star indicates its temperature. This relationship is fundamental in understanding thermal radiation and is used in many applications, from ovens to industrial furnaces.
When an electric device delivers a current of 15.0 A for 30 seconds, a total charge of 450 coulombs flows through it. This corresponds to about 2.8 x 10^21 electrons. Thus, approximately 2.8 sextillion electrons pass through the device in that time period.
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