When Casey looks at a CD or DVD she notices that there is a rainbow pattern that is created by the light. She became curious and
shone light directly at it and a pattern was created on the wall. What is the cause of this pattern?
2 answers:
Answer:
Interference
Explanation:
A CD is made up of thousands of pits arranged in the form of spiral tracks.These repeated patterns of pits form a thin film.
This film has the thickness of the order of the wavelength of the light which causes the interference of the waves of the light waves. The incident ray of light gets reflected from the top layer of the film partially and then after striking the bottom layer of the film creating a phase difference responsible for the constructive and destructive interference.
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Answer:
The magnitude of change in momentum is (2mv).
Explanation:
The momentum of an object is given by the product of mass and velocity with which it is moving.
Let the mass of ball is m. A tennis player smashes a ball of mass m horizontally at a vertical wall. The ball rebounds at the same speed v with which it struck the wall.
Initial speed of the ball is v and final speed, when it rebounds, is (-v). The change in momentum is given by :
p = final momentum - initial momentum
So, the magnitude of change in momentum is (2mv).