One 'rule of thumb' that many of us oldtime engineers carry in our decomposing
mental toolboxes is: 1 foot = 1 nanosecond. Since you asked, I'll calculate it now,
and see how close it is:
Speed of light in vacuum = 299,792,458 meters per second.
Use 1 meter = 3.28084 feet
Speed of light = 983571000 feet per second.
Speed of light = 0.98357+ foot per nanosecond
"1 foot = 1 nanosecond" is within 1.65 percent of being accurate.
2.5 feet (in vacuum) takes 2.5418 nanoseconds (rounded)
There are 86,400,000,000,000 nanoseconds in one day.
About 0.3 meters in a vacuum. Divide that by 1.0003 to get the distance in meters per nanosecond through air. Divide by 1.5 for glass.
If there is an unobstructed path, it can continue traveling practically forever.
60,000,000,000
1 second = 1 billion nanoseconds 4 seconds = 4 billion nanoseconds = 4,000,000,000 = 4 x 109
Light travels at approximately 299,792 kilometers per second in a vacuum. To find out how many nanoseconds it takes light to travel 3.50 meters, we can use the formula: time = distance / speed. Converting 3.50 meters to kilometers gives 0.0035 kilometers, and then calculating the time gives about 11.6 nanoseconds. Thus, it takes light approximately 11.6 nanoseconds to travel 3.50 meters.
It takes 1.3 to 1.4 nanoseconds for light to travel 1 foot.
Light travels at approximately 299,792 kilometers per second, which is about 186,282 miles per second. To find the time it takes for light to travel 372 miles, you can use the formula: time = distance/speed. This calculation shows that it takes roughly 2 milliseconds (or 2,000,000 nanoseconds) for light to cover that distance.
Light in a vacuum travels at 300,000 km per second. It will take distance divided by speed time to travel. Or 30 million thousand km divided by 300 thousand km/s = 100 000 seconds. This is 27.8 hours.
The Earth is 500 light-seconds from the Sun. One second is 10^9 nanoseconds.
473,099,999,999,999,936 nanoseconds.
3.1536E+24 nanoseconds.
Since a microsecond is a millionth of a second, just divide the distance light travels in one second, by a million.
There are 86,400,000,000,000 nanoseconds in one day.
About 0.3 meters in a vacuum. Divide that by 1.0003 to get the distance in meters per nanosecond through air. Divide by 1.5 for glass.
If there is an unobstructed path, it can continue traveling practically forever.
1 second = 1000000000 nanoseconds