pp21 - long steady note You know that you are a little off...

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PHYSICS: A World View Thursday, 7 April 2005 READ Ch 20 (p 414-424); PS 20: 1-2 PRAC Ch 16: Q 39, 45, 49, 55; E 23 HW #21 Ch 16: Q 40, 48, 54; E 26 Tu 12 Apr LAB #13 Resonance Pre = 1
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One end open--one end closed: anti-node at one end-- node at the other
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Mach Cones Mach Cones
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Moving source: Doppler Effect
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Moving source: Doppler Effect
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Moving source: Doppler Effect
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Moving source: Doppler Effect
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Unformatted text preview: long steady note. You know that you are a little off key because you are hearing beats at 2 hertz. Are you singing a little too high, a little too low, or can’t you tell? A guitar string produces 4 beats/second when played simultaneously with a 250 Hz tuning fork AND 9 beats/second when played with the 255 Hz tuning fork. What is the actual frequency of the guitar string? You are standing near two cars, A and B, which are both at rest. Each car has a siren that, when sounded together, produce beats at a frequency of 4 Hz. Car A now drives away and you hear the beat frequency increase . • Will the frequency of the sound you hear from Car A be higher or lower compared to its rest value while it is driving away? Explain your reasoning. • Which of the cars has the siren with the lower frequency? Explain your reasoning....
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