D: Refraction
Explanation: Refraction occurs when a medium bends the light rays of an object. Like water for instance as an example of a medium.
In order to completely describe a velocity,
you need a speed and a direction.
Well, one AU is 149,597,870 km. So, we would basically have to divide 4.5 billion km by 149,597,870, right?
4,500,000,000/149,597,870=30.080642 AU.
So, the correct answer would be 30 AU. Hoped this helped!
The intensity of a sound wave is defined as the amount of energy passing through a unit area of the wave front in unit of time.
