The alien musician in \"Star Wars\" is playing an instrument that can be modeled

Question

The alien musician in "Star Wars" is playing an instrument that can be modeled as an open-op cavity. If the performer made its instrument with a 3D printer just before the performance, and designed it to have a fundamental frequency of 110Hz; noting that the speed of sound in the bar where it would be performing was 343 m/s, then how long did the resonant cavity need to be? a. 0.78 m b. 1.56 m c. 3.12 m d. 6.00 m e. None of the above What frequency is heard by a stationary mouse just before being grabbed by a hawk which is flying at it at 25.00 m/s and emitting a screech frequency at 3500.0 Hz? Take the speed of sound to be 331.0 m/s. a. 3236 Hz b. 3254 Hz c. 3786 Hz d. 3764 Hz e. None of the above; dead mice tell no tails. Could a human perceive the sound made by the hawk in the previous question? a. Yes b. No Light Index of refraction its having a frequency in vacuum of 6.0 10^14 Hz enters a liquid of refractive index 2.0. In this liquid, its frequency will be: a. 1.5 10 14 Hz b. 3.0 10 14 Hz c. 6.0 10 14 Hz d. 12 10 14 Hz e. None of the above choices are correct.

Explanation / Answer

14) Using

2 L = v/f

L = 343/110/2 = 1.56m

Hence answer is B

15) Using

fo = fs(v/(v-vs) = 3500*331/(331-25) = 3785 Hz

Answer C

16) Yes

17) C- 6*10^14 Hz

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