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+--- Thread: Physics Help-Waves: You have three tuning forks, A, B, and C. Fork B has a frequency of 461 Hz; when A and B are sounded (/thread-165470.html)
Physics Help-Waves: You have three tuning forks, A, B, and C. Fork B has a frequency of 461 Hz; when A and B are sounded - 405 - 06-20-2014 04:30 PM
You have three tuning forks, A, B, and C. Fork B has a frequency of 461 Hz; when A and B are sounded together, a beat frequency of 2 Hz is heard. When B and C are sounded together, the beat frequency is 7 Hz. What are the possible frequencies of A?
lower frequency Hz
upper frequency Hz
What are the possible frequencies of fork C?
lower frequency Hz
upper frequency Hz
What beat frequencies are possible when A and C are sounded together?
lower frequency Hz
upper frequency Hz
- Woodsman - 06-20-2014 04:38 PM
| fa - fb | = fab
| fa - 461 | = 2
→ fa = 459 Hz, 463 Hz
| fc - fb | = fbc
| fc - 461 | = 7
→ fc = 454 Hz, 468 Hz
Possible beat frequencies for A and C are
468 - 459 = 9 Hz }
468 - 463 = 5 Hz } → So the possible beat frequencies are
463 - 454 = 9 Hz } → 5 Hz and 9 Hz, or 7 Hz ± 2 Hz
459 - 454 = 5 Hz }