Multiple Choice
In household wiring, copper wire with a diameter of is often used. What is the cross-sectional area of such a wire in (square millimeters)?
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1. Intro to Physics Units
Introduction to Units
Multiple Choice
Which of the following best describes a as used in astronomy?
A
The time it takes for the to orbit the .
B
The distance that travels in one .
C
The time it takes for to travel around the once.
D
The distance from the to the .
Verified step by step guidance1
Understand that a light year is a unit of distance, not time.
Recall that light travels at a constant speed in a vacuum, approximately \(3 \times 10^{8}\) meters per second.
Recognize that one year is a measure of time, specifically the time it takes for the Earth to complete one orbit around the Sun, about 365.25 days.
Combine these concepts: a light year is the distance light travels in the span of one year.
Therefore, the best description of a light year is the distance that light travels in one year.
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