Multiple choice

The metre is the length of the path travelled by ________________ in _________________ during a time interval of 1/299, 792, 458 of a second.

  1. sound, vacuum

  2. sound, air

  3. light, vacuum

  4. light, air

  5. none of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. Metre is the length of the path travelled by light in vacuum during a time interval of 1/299, 792, 458 of a second.