Assign13 - PHY 2130 Homework solutions Assignment 13 14.4...

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

View Full Document Right Arrow Icon
PHY 2130 Homework solutions Assignment 13 14.4 At 27 C 300 K T = ° = , the speed of sound in air is ( 29 ( 29 300 K 331  m s 331  m s 347  m s 273 K 273 K T v = = = The wavelength of the 20 Hz sound is 347  m s 17 m 20 Hz v f λ = = = , and that of the 20 000 Hz is 2 347  m s 1.7 10  m=1.7 cm 20 000 Hz - = = × . Thus, range of wavelengths of audible sounds at 27°C is 1.7 cm to 17 m . 14.25 With the train approaching at speed t v , the observed frequency is 345  m s 0 345  m s 442 Hz 345  m s 345  m s t t f f v v + = = - - (1) As the train recedes , the observed frequency is ( 29 345  m s 0 345  m s 441 Hz 345  m s 345  m s t t f f v v + = = - - + (2) Dividing equation (1) by (2) gives 345  m s 442 441 345  m s t t v v + = - , and solving for the speed of the train yields t v = 0.391  m s
Background image of page 1

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

View Full DocumentRight Arrow Icon
14.36 The mass per unit length of the wire is -3 -4 -2 0.300  10  kg 4.29 10  kg m 70.0 10  m m L μ × = = = × × , and the speed of transverse waves is 3 -4 600 N 1.18 10   m s 4.29 10  kg m F v = = = × × The fundamental or first harmonic of the wire has a wavelength of
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Assign13 - PHY 2130 Homework solutions Assignment 13 14.4...

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