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Quiz11_Sols

# Quiz11_Sols - Physics 53 Quiz#1 la lFall 2007 Name Recit...

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Unformatted text preview: Physics 53 Quiz #1 la lFall 2007 Name Recit. Section Circle the correct answer: 1. [3 points] When the same key is played on two different pianos, which stand next to each other, a beat is heard every 2.00 seconds. If one piano is tuned to the note E (330 Hz), by how much is the other piano detuned? 1;) 0.25 Hz. c) 1.00 Hz. 0.50 Hz. 61) 2.00 Hz. 2. [3 points] The second harmonic of a pipe open at both ends (pipe 1) has the same frequency as the fundamental of a pipe with one open and one closed end (pipe 2). What is the ratio of their lengths? “"gi’@ L] : 4143W Lﬂ-A C) 2L1: L2. 13) L1 = 2L2. M g d) 4L1: L3. m Lﬁ‘il DJ [4 points] Two loudspeakers emitting sound of the same frequency (440 Hz) and equal amplimde, but 180O out of phase, face each other. For what minimum separation of the two speakers will there be some point on the line connecting them at which complete constructive interference occurs? a) 0 cm. x , b) 19.5 cm. t? “Wm alt” ‘wéff’mwm I [email protected] 39.0 cm. L” i (L’°K) ﬁx 3%?1 d) 78.0 cm. 24 L %i 1..., a éWer a A _L a. Physics 53 Quiz #1 lb Fall 2007 Name Recit. Section Circle the correct answer: 1. [3 points] When the same key is played on two different pianos, which stand next to each other, a beat is heard every second. If one piano is tuned to the note C (262 Hz), by how much is the other piano detuned? a) 0.25 Hz. 1.00 Hz. b), 0.50 Hz. a) 2.00 Hz. 2. [3 points] The third harmonic of a pipe Open at both ends (pipe 1) has the same frequency as the fundamental of a pipe with one Open and one closed end (pipe 2). What is the ratio of their lengths? a) L] : 2L2. b) L] = 3L2 3. [4 points] Two loudspeakers emitting sound of the same frequency (262 Hz) and equal amplitude, but 180° out of phase, face each other. For what minimum separation of the two speakers will there be some point on the line connecting them at which complete constructive interference occurs? a) 0 cm. b) 32.7 cm. 65.5 cm. L“ d) 78.0 cm. ' ...
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