7c_practice_quiz_2-4.pdf

# 7c_practice_quiz_2-4.pdf - First Name Last Name ID Section...

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Unformatted text preview: First Name Last Name ID Section Question 3 (20 pts): While announcing the opening of a gladiatorial match, the tribune Messala stands before a. tiered grandstand, as shown in the ﬁgure below. He ﬁnds that when he speaks, he hears a pure tone echoing back at him with a frequency f = 255 Hz. a). Presuming this tone is the result of the sound waves reﬂected off of successive tiers of the grandstand interfering constructively, What is one possible value for the distance d as labeled in the ﬁgure? {The speed of sound in air is 340 :22.) Mature the em awful-1’41; to} swam ma, ivmir a; purities 91"?” 3M1, lea-7h an, {ppmiu @4440 M (rm Hp» 0‘“ low. J07 Cm Mme glow 7b “get an} w some aw at law ML Mmly Cﬂ’iir’bmiﬁ") i0 Ai [3* km as“ 75 94/} 0913mm ”Mapﬂr‘muj Wq, n ', a O w may 2 m . m A— a we in T ‘ A 2453 H). 3 , - 2_ a n? «0 2_ 3 mil Veda, 6Ww') b}. If the sound wave produced by Massala’s voice has an intensity of 70 dB and the pure tone echo has an intensity of ’7 0. i 50 dB, how much larger is the amplitude of Massala's voice than the amplitude of the echo? Show your work! 91%? I Z. i 0‘: H M We - . D .. 0 1 i I 5 - IQ J ~«A 70*513 —: pkg/0613:, J- ﬂag-- :7 20 '== i0/9ji0 f) . 45“ .5 1 l I! ...
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