# Just a reporting about speed of light

In this lecture you show that speed of light is 3,000,000,000 m/s, but the speed of light is a bit less than 300,000,000 m/s instead. I just wanted to report this error. Thank you

Hey Alessandro,

Thank you for your comment!

You are correct, the speed of light is a bit less than what is written in the lecture. However, notice the tilde sign in front of the number. It reads as * "is comparable to"* or

**which makes the statement correct - the speed of light is indeed of the order of 3 billion m/s. It would have instead been incorrect to put an**

*"is of the order of"***equal**sign there.

Hope this helps!

Kind regards,

365 Hristina

Good morning. No, it's NOT a bit less than what is written in the lecture! The speed of light is NOT of the order of 3 billion m/s. As I said above, the speed of light is a bit less than 300,000,000 m/s, and NOT a bit less than 3,000,000,000 m/s. The problem is not the tilde sign, the problem is the order of magnitude. Thank you

Hey again Alessandro,

I wasn't careful enough with my answer and it seems I've misread that, thank you for clarifying!

Kind regards,

365 Hristina