Questions: What isthe moximum size of an object that gests brighter and fairfer on a timescale of seconds?

What isthe moximum size of an object that gests brighter and fairfer on a timescale of seconds?
Transcript text: What isthe moximum size of an object that gests brighter and fairfer on a timescale of seconds?
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Solution

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Solution Steps

Step 1: Understanding the Question

The question asks about the maximum size of an object that can change in brightness and fairness on a timescale of seconds. This involves understanding the relationship between the size of an object and the time it takes for light to travel across it.

Step 2: Analyzing the Options
  • a few light seconds across: This means the object is a few light seconds in diameter, which is a reasonable size for changes on a timescale of seconds.
  • it can be any size: This is unlikely because larger objects would take longer for light to travel across, thus changing brightness on a longer timescale.
  • a few kilometers across: This is much smaller than a few light seconds and would change brightness very quickly.
  • a few nd across: This option is unclear and likely a typographical error.
Step 3: Applying the Concept of Light Travel Time

The maximum size of an object that can change brightness on a timescale of seconds is determined by the distance light can travel in that time. Light travels approximately 299,792 kilometers per second. Therefore, an object a few light seconds across would be the correct size.

Final Answer

\(\boxed{\text{a few light seconds across}}\)

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