Chapter 16 - Sound And Hearing

Question 1

What is interference?

Answer 1

When two or more waves overlap in the same region of space.

Question 2

What is a beat

Answer 2

Beats are heard when two tones with slightly different frequencies are sounded together.

Question 3

What is the beat frequency?

Answer 3

F= fa-fb

Question 4

What is the Doppler effect?

Answer 4

The frequency shift that occurs when there is a motion of a source of sound, listener or both.

Question 5

What is a shock wave?

Answer 5

A sound source moving with a speed greater that the speed of sound creates a shock wave. The wave front is a cone with angle a.

Question 6

Shock wave formula

Answer 6

Sina=v/vs

Question 7

Maximum pressure of sound for a sinusoidal sound wave

Answer 7

BkA

Question 8

Speed of sound in a longitudinal wave in a fluid

Answer 8

SQRT(bulk modulus/density)

Question 9

Speed of a sound wave in an ideal gas

Answer 9

SQRT(heat capacities*temperature/molar mass)

Question 10

Speed of sound in a longitudinal wave in a solid rod

Answer 10

SQRT(Young’s modulus/density)

Question 11

Intensity formulas:

Answer 11

0.5SQRT(densityB)omega^2A^2

=pmax^2/2densityv

Question 12

Intensity of a sinusoidal sound wave in a fluid

Answer 12

Pmax^2/2SQRT(density*B)

Question 13

Sounds intensity level

Answer 13

10*10^-12log I/I0

Question 14

Standing sound waves for an open pipe

Answer 14

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Question 15

Standing sound wave for a stopped pipe

Answer 15

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