Weekly_001.SOLN - 2011 E. Szarmes PHYS 274 Q1R.2 a) WEEKLY...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
© 2011 E. Szarmes PHYS 274 WEEKLY ASSIGNMENT 1 — DUE MONDAY, JAN 24/11 PROF. SZARMES Q1R.2 a) Although buzzing lips do not emit a single frequency, there is a vaguely discernable pitch which emphasizes vibrations within a narrow range of frequencies. If this range includes one of the resonant frequencies (modes) of the bugle, it will build up a resonant, standing wave pattern corresponding to that normal mode. That is the normal mode frequency that is emitted from the open end of the bugle. b) In a bugle (which is a tube either open at both ends or closed at one end; we haven’t figured it out yet), only certain discrete and well separated frequencies can be supported. If the frequencies produced by the buzzing lips fall between two of these normal mode frequencies, no resonances will be excited and no sound will emerge. c) For the present case, we don’t yet know if the bugle is open at both ends or closed at one end, but we know that the frequency difference between adjacent normal modes is the same: Open/Open: Open/Closed: The frequency difference between adjacent normal modes in both cases is given by For the bugle, we calculate: i) Δ f ~ 392 Hz – 329 Hz = 63 Hz ii) Δ f ~ 329 Hz – 261 Hz = 68 Hz iii) Δ f ~ 261 Hz – 196 Hz = 65 Hz
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/07/2011 for the course PHYS 274 taught by Professor Ericszarmes during the Spring '11 term at University of Hawaii, Manoa.

Page1 / 3

Weekly_001.SOLN - 2011 E. Szarmes PHYS 274 Q1R.2 a) WEEKLY...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online