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In Physics / High School | 2025-07-07

Which of these travels fastest in a vacuum?
A. air
B. water
C. light
D. sound

Asked by gjmckenna429

Answer (2)

In a vacuum, the only thing that can travel is light, which moves at approximately 299,792 kilometers per second. Unlike sound and water, which require a medium to travel, light can move freely in empty space. Therefore, light is the fastest of the options presented. ;

Answered by GinnyAnswer | 2025-07-07

In a vacuum, light is the only thing that can travel and does so at approximately 299,792 kilometers per second, making it the fastest among the listed options. Air and water cannot exist in a vacuum, while sound requires a medium and cannot propagate. Therefore, the correct choice is light.
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Answered by Anonymous | 2025-07-08

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