# Quiz1 - an unknown You may assume the amplitude does not...

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SS1 7C Quiz 1 Student ID: ___________ Name: ____________ , ______________ |_____| Rubric Codes : last first DL Sect. # I certify that I will abide by the UC Davis Code of Academic Conduct …Signature : ______________________ ANSWERS WITHOUT WORK WILL RECEIVE NO CREDIT. MARK YOUR ANSWERS CLEARLY. y( x , t ) = Asin( 2 " t T ± 2 x # + \$ ) " ( x , t ) = 2 t T ± 2 x + % v= λ /T = A sin Φ v light = 3 × 10 8 m/s v sound : 346 m/s in air, 1500m/s in water You spend a hot Davis afternoon at the swimming pool. You are below the water’s surface, such that along the line connecting the speaker to you, there are 4.5 meters between the speaker and the water’s surface, and another 0.5m underwater, to reach you. The speaker emits a single note, as depicted in the graph below right (note that the horizontal axis is in milliseconds). 1) a) (50%) Write the wave equation for the sound wave while in the water . Solve for numeric values for everything except for the fixed phase constant, which you can leave as

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Unformatted text preview: an unknown. You may assume the amplitude does not change. Show how you get each value. b) (10%) Using the fact that the amplitude is a maximum at t=0s, a physics 7C student (A) says the total phase at that point must be π /2. Another physics 7C student (B) says the phase constant at that point must be π /2. Decide who is correct. Your choices are A, B, both, or neither. No explanation required. Answer _____________ Δ P[Pa] For x=2.25 m, in air t[ms] OVER! 2) (40%) Your friend (who is also taking 7C) thinks that being able to add two sounds waves to produce near silence is pretty amazing. She decides to make this happen. She uses a note with a wavelength of 4 meters, places one speaker 2 meters from her and the other 6 meters from her. Can she succeed, or will she fail? Explain fully, either what she must do, or why this won’t work. Solutions should not need to go beyond this point!...
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Quiz1 - an unknown You may assume the amplitude does not...

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