Which planet moves the fastest?
a. Earth
b. Mars
c. Venus
d. Mercury
Question 2
How many times greater is the speed of red light ( = 700 nm) than the speed of violet light ( = 400 nm) in a vacuum?
a. 1.75 , the first color of light is faster
b. 0.57 , the second color of light is faster
c. 3.00 108 , the first color of light is faster
d. 1.00 , both colors of light have the same speed
e. 3.00 108 , the second color of light is faster