03prob - Physics 9B-A Problem Solutions #3 Cole [Q16.1]...

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

View Full Document Right Arrow Icon
Physics 9B-A Problem Solutions #3 Cole [Q16.1] When sound travels from air into water it speeds up by a factor of 10 due to the larger bulk modulus. The sound waves in the water are generated by the sound waves in air which means the water will vibrate at the same frequency the air is vibrating against the water. The frequency, thus, does not change. Because the speed increases in water and the frequency stays the same, the wavelength becomes longer. [Q16.12] The amount of energy absorbed does not play a major role in the decrease in the amplitude with distance. The energy absorbed depends linearly on the distance r from the source so it decreases the intensity by 1/ r ; however, because the energy must be spread over an area which grows as 4π r 2 , the intensity decrease as 1/ r 2 due this effect. [Q16.21] The bow wave of the jet represents the forward edge of the sound from the jet, so A can see the jet but not hear it. B is getting hit with the shock and is hearing a sonic boom. C hears the normal sound waves of a jet. [P16.20] a) Use one quadruplet as the reference intensity : β = () = 10 4 6 db db log I I o o . b) To increase another 6 db, would require 16 babies (16 Iø/4Iø) or 12 more babies. [16.40] Use f vv f toward away L L s s = ± m . a) f v f LA L A = = 344 15 344 392 Hz = 375 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.

Page1 / 3

03prob - Physics 9B-A Problem Solutions #3 Cole [Q16.1]...

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