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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 /2. Another physics 7C student (B) says the phase constant at that point must be /2. Decide who is correct. Your choices are A, B, both, or neither. No explanation required. Answer _____________ 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 wont work. Solutions should not need to go beyond this point!...
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- Spring '12