Question

SI unit of distance is

• A. $cm$
• B. $m$
• C. $km$

Answer 1

The correct option is B

$m$

Correct option is B: $m$

Explanation of correct option:

• Option B: One meter is the distance traveled by a ray of electromagnetic (EM) energy through a vacuum in $1/299,792,458=(3.33564095x{10}^{-9})$ of a second. $m$is SI unit of distance.

Explanation of incorrect option:

1. Option A: $cm$ is also unit of distance. $cm$ is CGS unit of distance. Hence, this option is incorrect.
2. Option C: $km$ is also unit of distance but it is not SI unit of distance ($1km=1000m$). Hence, this option is incorrect.

Final Answer: Option B