LIGHT

Returns the speed of light c in vaccum, in meters per second (). This is a physical constant.

Syntax

LIGHT(accuracy)

accuracy Optional. A Boolean expression, either TRUE or FALSE. Decides whether an accurate value should be returned by the function. Default is TRUE if omitted.

Example

Function
Answer
Explanation
= LIGHT() 299,792,458 The speed of light in vacuum is 2.99792458 ? 108 ms-1.
This is an exact (accurate) value.
By default, the value for the “accuracy” parameter is TRUE. Therefore, if omitted, the function returns an accurate value.
= LIGHT(TRUE) 299,792,458 The answer is the same as above.
= LIGHT(FALSE) 3E+08 . A rough value is returned.
This value is often used in text books.