You have probably seen the heating curve of water. This graph represents a cooling curve of another substance. You can see that over time, the temperature of the substance decreases and the substance changes from a gas to a liquid to a solid. What other information do we know about this substance as it changes?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

i believe the answer is true.