Scelta multipla
Which of the following objects has the largest ?
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1. Intro to Physics Units
Introduction to Units
Scelta multipla
In the context of astronomical distances, how long does it take light to travel in terms of ?
A
Earth years
B
Earth year
C
Earth years
D
Earth day
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Understand the definition of a light-year: it is the distance that light travels in one Earth year.
Recall that the speed of light is approximately \(3 \times 10^{8} \text{ meters per second} \).
Calculate the distance light travels in one Earth year by multiplying the speed of light by the number of seconds in one Earth year: \( \text{distance} = \text{speed} \times \text{time} \).
Since a light-year is defined as the distance light travels in one Earth year, the time it takes light to travel one light-year is exactly one Earth year.
Therefore, the answer to how long it takes light to travel one light-year in terms of Earth years is one Earth year.
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