in my room air
is not clear but it is not main problem

laser pulse 0,5 sec
laser own Hz 120 000 000

good tip ( we can see the same Ytube 8x ,24x slower )

Laser ------10 m--------wall <<< 30 km/s ? 220 km/s
............^
............^
............^
............30 km/s

http://youtu.be/toUzglQZmyw


Last edited by newton; 03/21/14 08:10 PM.