Princeton Ch 12 - Sound

Question 1

Sound waves are ___ waves, because the direction in which the particles of the conducting medium is PARALLEL to the direction in which the wave travels.

Answer 1

Sound waves are longitudinal/compression waves, because the direction in which the particles of the conducting medium is PARALLEL to the direction in which the wave travels.

Question 2

As a stereo speaker vibrates, it creates regions of high pressure, ___, that alternate with regions of low pressure, ___.

Answer 2

As a stereo speaker vibrates, it creates regions of high pressure, COMPRESSION, that alternate with regions of low pressure, RAREFACTION.

Question 3

The speed of sound is dependent on:

Answer 3

1) the medium’s resistance to compression

2) density of the medium

Question 4

Sound can travel through solid, liquid and gas. Which medium can it travel through the fastest?

Answer 4

Sound travels slowest through gases, faster through liquids, and fastest through solids.

Question 5

Speed of sound in air is about ___.

Answer 5

340m/s

Question 6

Big Rule #1 for waves.

Answer 6

The speed of a wave is determined by the type of wave and the chracteristics of the meidum, not by the frequency.

Question 7

Standing sound waves in pipe - antinode.

Answer 7

The open end of a pipe corresponds to an displacement antinode or pressure node.

Question 8

Standing sound waves in a pipe - node.

Answer 8

The closed end of a pip corresponds to a displacement node (no motion) or a pressure antinode

Question 9

How do you figure out the L of a wave in an open pipe?

Answer 9

λ(n) = 2L/n, n = 1, 2, 3…….

Question 10

How do you figure out the L of a wave in a closed pipe?

Answer 10

λ(n) = 4L/n, n = 1,2,3