Answer:
If an object has a fast velocity, the dots on a ticker tape diagram will be far apart.
Number 4 is c , number 5 is a , number 6 is d and 7 is a
Answer:
Refractive index of a medium = Speed of light in vacuum/Speed of light in a medium
1.5 = 3 x 108 / Speed of light in medium
Speed of light in the medium = 3 x 108 /1.5
= 2 x 108 m/s.
Explanation: