Name ______
Date ______PD _____
Waves and Light Review
1. Which set of waves shown below is in order from lowest to highest frequency?
2. What is the frequency of the wave shown below?
3. What is the period of a wave that has a wavelength of 1.0 m and is traveling at 3.0 m/s?
4. A student sits on one side of a door sending a horizontal pulse along a rope that runs under the door. The reflected pulse comes back on the same side. What information can be inferred from this observation about how the rope is attached?
5. A physicist measures the speed of an electromagnetic wave as 2.0 C 108 m/s in a medium. What is the index of refraction of the medium?
6. In which medium would do sound waves not travel?
A. a vacuum B. air C. water D. glass
7. A pulse travels from a spring (heavy) to a thin thread (light) that is attached to a wall.
Draw the system just after the transmitted pulse reflects off of the wall (fixed end).
8. A child is playing with a string attached to a doorknob. She sends a series of pulses down the string. Assume that the pulses are reflected with no loss of amplitude. If all the pulses have an amplitude of 15 cm, describe the amplitude that is seen by the child where an incident pulse and reflected pulse meet? Explain using superposition to receive credit.
9. Two wave pulses are traveling on a rope in opposite directions, as shown in the diagrams. The wave pulses have the same length and amplitude.
Draw what happens when wave X meets wave Y.
10. A train whistle produces a pitch of 400 Hz when the train is not moving. If an observer is stopped at a railroad crossing and the train passes him at time t, describe what happens to the frequency of sound as the train is moving away from the observer.
11. The stars in a galaxy emit light with a wavelength of 300 nm, but this light appears to have a wavelength of 200 nm to an astronomer on Earth. Describe the direction of motion for the galaxy relative to Earth? Explain in terms of Doppler effect.
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