None. The speed of light is usually assumed to be constant. The symbol used to represent the speed of light is "C", as in E=MC2. Then why is it called a variable speed?
Variable: A letter or symbol used to represent a number or quantities that vary
any number at all
a variable
a is used as a symbol to represent a variable.
In mathematics and physics, the letter "k" is often used to represent a constant because it is derived from the German word "konstante." This convention helps distinguish constants from other variables, particularly when multiple constants are involved. Additionally, using "k" can help avoid confusion with the variable "c," which is commonly used to represent the speed of light in physics.
The letter "c" is used to represent the speed of light in a vacuum in physics equations.
Variable: A letter or symbol used to represent a number or quantities that vary
#
a variable
A letter used to represent a number is called a variable. Typically, the letters x and y are used, but technically you can use any letter of the alphabet.
any number at all
It is a variable
A letter used to represent a number is a variable of sometimes a constant.
A variable
variable
Variable
a variable