Chapter 3

Question 1

Express the answer in scientific notation: 10.0 + 186.2 x 24

Answer 1

4.5 x 10^3

Question 2

Conversion of energy from one form to another is known as ___. An example of this would be a hearing aid because it changes sound into an electrical signal.

Answer 2

Transduction

Question 3

what is the correct scientific notation of 24,000?

Answer 3

2.4 x 10^4

Question 4

Using this formula, what is the wavelength in m of a sound whose frequency is 2 kHz?
wavelength = c/f
c=340 m/s

Answer 4

0.17

Question 5

Measured sound pressure is
at 6 meters from the source. What is the sound pressure of the same sound at 30 meters from the source in uPa?
SP2 = SP1 / ((r2/r1)^2)

Answer 5

2

Question 6

If the frequency is doubled, what happens to the period?

Answer 6

it is halved

Question 7

If the frequency is halved, what happens to the wavelength?

Answer 7

it doubles

Question 8

If the period is doubled, what happens to the speed of sound?

Answer 8

no change

Question 9

If the speed of sound is halved, what happens to the period?

Answer 9

no change

Question 10

If the speed of sound is doubled, what happens to the wavelength?

Answer 10

it doubles

Question 11

speed of sound unit

Answer 11

m/s

Question 12

frequency

Answer 12

Hz (cycles/sec)

Question 13

period

Answer 13

second or msec

Question 14

wavelength

Answer 14

meter or any unit of length

Question 15

phase

Answer 15

degree of arc (btwn 0-360)

Question 16

amplitude of sound wave in air

Answer 16

Pa

Question 17

The graph below shows a representation of a sinusoidal sound wave. What is the RMS amplitude? Give your answer in units of micropascals. Use standard decimal form, and use three decimal places. (goes up to 1 and down to 1, sinusoidal wave)

Answer 17

0.707

Question 18

The graph below shows a representation of a sinusoidal sound wave. What is the wavelength? Assume the speed of sound is 343 m/s. Give your answer in units of meters. Use standard decimal form.

same graph as described above (2 cycles)

Answer 18

0.343

Question 19

The Inverse Square Law accounts for obstacles in the area.

Answer 19

False

Question 20

Calculate the wavelength in meters of a sound whose frequency is 1,000Hz.

Answer 20

0.343

Question 21

How many significant digits does each of the following numbers have?

0.0037
8000.1
2.9
32.00
12.009
0.00320

Answer 21

2
5
2
4
5
3

Question 22

Among these numbers, which number is the biggest?
9.8 E 8
9.8 E -9
98,000,000
9.8 x 10^(6)

Answer 22

9.8 E 8

Question 23

Simple harmonic waves are ____________.

Answer 23

periodic

Question 24

Number: 9.22 x 10^-2

Which one of these numbers is base? Which is the coefficient?

Answer 24

co: 9.22
base: 10

Question 25

Using the formula for wavelength below, calculate the wavelength in meters of a sound whose frequency is 740Hz. You do not need to use scientific notation. Please round to three decimal places. wavelength = c/f c = 340m/s

Answer 25

0.459

Question 26

All other things being equal, if the frequency is doubled, what happens to the period? (Here are equations from this chapter for reference. You may or may not use them.) T = 1/f wavelength = c/f

Answer 26

it is halved

Question 27

What is 20.1 + 5.0 * 113.9? Please use correct scientific notation and round to the first decimal (Example: 2.1x10^3)

Answer 27

5.9 x 10^2

Question 28

Match the following terms with their definition: Frequency: Period: Wavelength:

Answer 28

The number of cycles in a second The length of time a single cycle lasts The distance of a single cycle

Question 29

If you have a sinusoid that has a frequency of 5000Hz, what is its wavelength in meters? Express your answer in scientific notation and round to the first decimal point.

Answer 29

6.9 x 10^-2

Question 30

If the period of a sinusoid is 7ms, what is its frequency in Hz? Round to the first decimal place

Answer 30

142.9

Question 31

What is its wavelength in meters for the 7ms sinusoid? Round to the first decimal point.

Answer 31

2.4