PHYS 1070 Final: Practice+Final+Exam+solutions
22 Nov 2015
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1: travelling sound wave in +x direction. Forms for travelling wave are: y= y0 sin (2 . Y = y0 sin [4000 (t - Ans (c: intensity level , il at 15m. = og -1 (8. 5) i = i0 (10 8. 5 ) The standard reference intensity i0 = 10-12 w/m2. P = (3. 16 (note, the distance 15. 0 m is irrelevant) If two waves of frequency f1 and f2 are added, the beat frequency fb is fb = | f1 f2 | (abs. value is not in text, but is in lab manual) 5 = | fstring - 440| = | fstring 450 | The only common solution is fstring = 445, hence the 2nd harmonic is at. Ans (b: clearly, only (d) is false, lens r1 r2 oil (n2) light water (n1) By conventions, both r1 and r2 are positive. Ans (e: the near point of 0. 25m is normal . But corrections are needed for the far point (myopia).
