thorntonforce:
No worries, iv already measured it...it's 300000 km/s
You seem to have made an error in your calculations it is slightly less than that 
What is your budget both in money and in time? You can also bounce radio signals off the moon and time the difference between sending a pulse and when you receive the pulse. Transit time is 1/2 that value. You can look up today's distance to the moon and compute the speed of your pulse which is speed of light.
Either laser or radio, you will need a way to accurately point to the moon in azimuth and elevation.
Paul
ahmed44:
hello guys
my professor in collage asked me to do an experiment with arduino to measure the speed of light
Assuming a non-accelerating thing moving in a straight line, its speed is a ratio of distance travelled divided by the time taken to travel that distance.
Distance needs to be measured, as well as ..... time taken needs to be measured. Even if you have something for light to bounce off, far away, and assuming the arduino is able to measure the return time of the light traversal ...... the distance travelled also needs to be measured or estimated, somehow. Otherwise, you'd have to write down a value of distance which somebody else had measured and quote them..... in which case, might as well write down the speed of light as well, as they already did the hard yards to estimate speed of light already.
Right now, the best bet would be to bounce a laser light off the moon, where the mirrors on the moon were deliberately placed there for that purpose, and measure the time it takes for the light to bounce off and return.
That was Fizeau with the rotating disk in 1851, which was improved on.
He was trying to show that C in water is subject to movement of the water. So were the others.
Distance needs to be measured, as well as ..... time taken needs to be measured. Even if you have something for light to bounce off, far away, and assuming the arduino is able to measure the return time of the bounce...... an assumption still needs to be made about distance travelled.
The mechanics of the orbit of the moon to a very close degree have been known since the 17th century. Einstein had to look to Mercury to find a difference significant enough to show the world.
GoForSmoke:
The mechanics of the orbit of the moon to a very close degree have been known since the 17th century. Einstein had to look to Mercury to find a difference significant enough to show the world.
That's the geniusness of people, especially those ones centuries ago. Einstein and co .......remarkable.
Here's a relevant thread:
https://forum.arduino.cc/index.php?topic=406165
Southpark:
That's the geniusness of people, especially those ones centuries ago. Einstein and co .......remarkable.
They used to teach these things in school, at least to the students on the > 99 side of the IQ curve.
That's not saying that everyone who took the courses got it but you don't have to be a genius to get it.
Since the Reagans dumbed the entire country down 10 or 20 points though.. we have this new, darker age.
Hail Trump. Stupid Rulez.
AWOL:
I once saw a demonstration of measuring c using a slightly modified microwave oven and a large slab of chocolate.
Didn't Dara O'Briain's Science Club cover that with microwaved toast? Fun show, lots of points to start from.
thanks guys
but i gave up on the idea because both my budget and time wouldn't
help me to conduct the experiment may be i will try Foucault Method.
but i told my professor and he admit that i will be hard with the arduino
but may be he will give me another thing and i might need help also
thanks again
With the Arduino you can count rpm and sense light.