How long does it take light to travel one km?

Answer 1

In one nanosecond (ns), light will travel 30.0 cm, about 1 ft.

The speed of light (in a vacuum*) =

186,000 miles per second, or

0.000186 miles per nanosecond, around 1 foot/ns.

*note: Light travels slower moving through matter.

Answer 2

If the information given in the question is accepted as correct, then light travels one meter

in 330 nanoseconds.

But the decimal places/powers of ten in the question have slipped, and the given data-point

is inaccurate by a factor of 99.

The speed of light is 300,000 kilometers per second, or about 990,000 km in 3.3 seconds.

A more accurate time for a trip of one meter at light-speed is 3.3 nanoseconds.

Here's a cool rule of thumb for Americans: " 1 nanosecond per foot " is off by less than 2% .

Answer 3

"Kilometers per second" is a speed. "Light-year" is a distance. These two units measure different quantities and have different 'dimensions'. Neither one can be converted into the other one. A light-year is a distance of roughly 5,878,700,000,000 miles (9,460,890,000,000 kilometers).

Answer 4

The speed of light in the standardized medium of free space is a physical constant defined as 299,792,458 metres per second. It is often denoted by the symbol c - originating from the Latin word celeritās (speed). The speed of light was officially included in the International System of Units on October 21, 1983, leaving the metre defined in terms of both c and the second. The speed of light in a material is the apparent speed that light travels in that material and may be very different than c. (In the simple view that matter is atoms in a matrix of free space, light moves at c in the space between atoms, but is constantly being absorbed and re-emitted, which delays it, and makes it appear to travel slower.)

Answer 5

A light year is a unit of distance, not a moving thing - it is the distance covered by light in a vacuum in one year.Light itself, however, travels at exactly 299,792,458m/s. This is often shortened to 3.00x108ms-1.

Answer 6

The speed of light in vacuum is denoted by the letter c. It is a universal physical constant.

The value of c is 299,792,458 meters per second or 186,282 miles per second.

The value of c is 17,987,547,480 meters per minute or 11176920 miles per minute.

The value of c is1,079,252,800 kilometers per hour or 670,616,629,384 miles per hour.

Answer 7

A lot.

Well: Light travels 186,000 miles per second...

(I answered this before but someone changed it so I lost my numbers, but here is the sequence):

186,000 mps:

*60 into hours

*24 into day

*5280 into feet

/ 3.28084 into meters...

With a result of... 431,046,683,166 meters per day.

Answer 8

Light travels at a speed of approximately 300,000 kilometers per second, so it would take light about 0.0033 seconds to travel one kilometer.

Answer 9

Light travels at 299,800 kilometers per second. So light travels 1 km in 1/299,800th of a second. So, 0.0000033356 seconds.

Answer 10

0.0000067 second (rounded) = (6 and 2/3) microseconds