Question 1
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On a hot day in the desert (T = 44 degrees C), a sound of 337 Hz is emitted by a car travelling at 149 km/h toward a police officer. If the sound frequency received by the police officer is 407 Hz, determine the speed of the police officer (in km/h).
Provide a positive answer if the police officer is travelling toward the speeding car or a negative answer if the police officer is travelling away from the speeding car.
Question 2
Air is blown across the top of a partially filled pop bottle and a resonant hum is produced. What happens to the frequency of the resonance as the level of the pop goes down in the bottle?
Select one:
Question 3
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An air column with one open end resonates in a mode with 3 nodes and 3 antinodes at a frequency of 606 Hz. Find the frequency of resonance (in Hz) if there are 9 nodes and 9 antinodes instead.
Question 4
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A ray of light passes from vacuum into a different substance where the speed of light decreases by 20%. What is the index of refraction of the substance it is traveling in?
Select one:
Question 5
A ray of light is traveling from water (n = 1.29) into glass (n = 1.63). The light ray hits the glass at an angle of 47.4° with respect to the normal. What is the angle (in “deg”) of refraction of the light ray?
Question 6
A certain material has n = 1.38 for light at 700 nm, and 1.79 for light at 400 nm. If white light (coming from air) is incident on a piece of this glass at an angle of 49.2°, what is the difference in angle (in deg) between the 400 nm and 700 nm rays inside the glass? Enter the difference as a positive number.
Question 7
A liquid with an index of refraction 1.62 is put in a glass with index of refraction 1.46 . What is the critical angle (in deg) for internal reflection of a ray in the liquid when it is incident on the liquid-to-glass surface?
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