January 26, 2011 § Leave a comment
In 90 seconds the light travels more than 5 billion times 5 meters.
Here, it created a black point on the photo paper.
1. Prepare a photo paper and a laser measurer in a dark room.
2. Define a distance between the photo paper on the wall and the laser measurer.
(For example 5 meters)
3. Leave the laser beam of the device on for a while.
(For example 90 seconds)
4. Calculate how many times the laser beam crosses the space of 5 meters
between the device and the photo paper during the 90 seconds.
Given that the light travels two hundred and ninety-nine million seven hundred
ninety-two thousand four hundred and fifty eight meters per second,
the equation is :
x = ( 90(sec) * 299 792 458(m/sec) ) / 5(m)