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week 10a - Physics 1240 Today Bowed string natural modes of...

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Physics 1240 Tues 3/15/2011 Today: Bowed string, natural modes of vibration Next time: Percussion instruments, waves in a pipe Last time: Waves on a string Standing waves = natural modes of vibration: f, 2f, 3f, … Nodes and anti-nodes Frequency of the fundamental: Outline - Quick review of last time - Violin family - Bowed strings - Natural modes of the body and bridge - General natural modes of vibration
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CQ 10.1 What will happen to the frequency of a guitar string if you double the mass of the string, keeping everything else fixed? A) Increase the frequency by 2. B) Increase the frequency by 4. C) Decrease the frequency by 2. D) Decrease the frequency by 4. E) None of the above.
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CQ 10.2 What would increase the pitch of a string by two octaves? A) Increase the tension by 8. B) Increase the tension by 4. C) Decrease the length by 8. D) Decrease the length by 4. E) None of the above.
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CQ 10.3 Sound waves in the 60-80 dB SIL range coming from an acoustic guitar (no electronic pickup) are generated by A) Vibrating strings resonating with sound waves.
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