Speed of Ultraviolet Light Traveling to Earth
How long will it take for the ultraviolet light to reach Earth?
A. 2.7 × 10⁻² hours
B. 2.2 × 10³ hours
C. 3.7 × 10⁴ hours
D. 1.3 × 10⁵ hours
Answer: C. 3.7 × 10⁴ hours
Given the speed of the ultraviolet light and the distance it must travel, the time it will take for the light to reach Earth is 3.7 × 10⁴ hours.
Speed is defined as the distance traveled per unit time. Mathematically, speed is calculated as Speed = Distance ÷ Time.
For the ultraviolet light traveling to Earth:
Speed of the Ultraviolet light = 3.0 × 10⁸ m/s = 1.08 × 10⁹ km/h
Distance it must cover = 4.0 × 10¹³ km
Time taken = ?
By substituting the given values into the speed formula:
Speed = Distance ÷ Time
1.08 × 10⁹ km/h = 4.0 × 10¹³ km ÷ Time
Time = 4.0 × 10¹³ km ÷ 1.08 × 10⁹ km/h
Time = 3.7 × 10⁴ hours