PPT14 - Sound and Fury The time sequence of alternating...

This preview shows pages 1–4. Sign up to view the full content.

Sound and Fury The time sequence of alternating dense-thin regions of air from the vibrations of the arm of a tuning fork constitutes a traveling longitudinal wave which is registered by our bodies as sound. Needs a medium to propagate. But has properties similar to light . These waves, you may recall, satisfy the relation v = f . λ (velocity/speed = frequency x wavelength) The speed of sound through air at room temp . is 1100 ft/s or 330 m/s . λ

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

View Full Document
Sound Effects Sound waves, unlike light, require a medium to carry them. Thus it is entirely logical to expect that the speed of sound will depend upon the medium. In nature for various media , it is found that the speed increases in this order, in general, gas-> liquid/fluid-> solids Thus, sound travels faster through water (1500 m/s) and steel (6000 m/s) than through air (330 m/s), exactly opposite the behavior of light . Ever wonder why, in old movies, the cowboy puts his ear to the rail to find out if a train is coming? All things being equal and in the same kind of medium - say a gas - sound speed decreases with increasing density , exactly as light but against the order as you cross media. An indication of the “ orneriness ” of sound! It follows then that as a gas gets hotter, sound travels faster in it.
Sound Effects II For every degree rise in temp. in air (and thus a drop in

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 8

PPT14 - Sound and Fury The time sequence of alternating...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online