Answer the question

Light travels fastest through which of the following?

OPTIONS:
- air
- glass
- water
- a vacuum
a vacuum
Svara på frågan Ljuset färdas snabbast genom vilken av följande? ALTERNATIV: - luft - glas - vatten - ett vakuum
Answer the question The Light travels fastest through which of the following? ALTERNATIVE: - air - glass - water - a vacuum
ett vakuum
a vacuum