The sun provides energy to the earth through which of the following processes?

a. alpha decay

b. beta decay

c. fusion

d. fission

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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.