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 work done by the motor is 531,45 Joules
Explanation:
Using a sketch of the possible conditions, we need to find the distance that the block was moved, in order to find the work done by the electrical motor.
The sketch could be seen in the attached image.
According to the right-hand thumb rule, the forefinger gives the velocity of charge, the thumb gives the magnetic force and the center finger gives the direction of magnetic field.
then, as shown in the picture, the <span>direction of the magnetic force on the charge is in the right direction.</span>
then, as shown in the picture, the <span>direction of the magnetic force on the charge is in the right direction.</span>