Module 8A: measuring sound in the real world

Question 1

What is the number of cycles completed per second. It is measured in unites called Hertz.

Answer 1

Frequency

Question 2

The time is takes to complete one cycle of vibration is called?

Answer 2

Period

Question 3

Humans can hear a range of frequencies from about 20 hz to?

Answer 3

20 kHZ

Question 4

The DISTANCE covered by sound in the period is?

Answer 4

wavelength

Question 5

The DISTANCE between successive rarefaction or compression peaks is known as ?

Answer 5

wavelength

Question 6

What are multiples of the lowest frequency present in a sound?

Answer 6

harmonics

Question 7

What is the doubling of frequencies?

Answer 7

Octaves

Question 8

We perceive frequency as the ____of the sound.

Answer 8

The pitch

Question 9

True or false. Pitch and frequency as a 1:1 ratio.

Answer 9

FALSE.

Question 10

What is the magnitude or level of sound?

Answer 10

Intensity

Question 11

The range of human hearing is approximately ____ from threshold to pain.

Answer 11

120 dB

Question 12

How we describe our perception of magnitude of sound is called?

Answer 12

loudness

Question 13

The purpose of sound measurments are all of the following except:

a) to calibrate test equipment
b) to test acoustic levels amongest individuals with thresholds above 20 upA
c) to assess background level in test rooms and learning environments
d) to identify hazardous noise exposure

Answer 13

b) ) to test acoustic levels amongest individuals with thresholds above 20 upA

Question 14

sound level meters are dependent upon the ?

Answer 14

Microphone

Question 15

Microphones have a dynamic range. Explain what the means

Answer 15

Range of frequencies the microphone is sensitive to

Question 16

The most difficult parts of the dynamic range for a sound level meter to measure are :

a) Soft sounds below 20dB
b) loud sounds above 100 dB SPL
c) all the above

Answer 16

c) all the above

Question 17

A general type 2 sound level meter provides you with

Answer 17

1 number representing the overall amplitude of the sound

Question 18

A micriphone can be set to a (chose two)?

a) linear response
b) weighting factor
c) frequency response
d) amplitude response
c) magnitude calibration

Answer 18

a) linear response

b) weighting factor

Question 19

De-Emphasizes low frequency sounds is called? .

Answer 19

weighting factor

Question 20

Sound level meter (SLM) measures overall SPL of sounds picked up by the microphone is called?

Answer 20

Linear setting

Question 21

What is a device that measures the pressure of sounds?

Answer 21

Sound level meter (SLM

Question 22

True or false:

SLM (sound level meters) pick up all frequencies within a certain range?

Answer 22

True

Question 23

True or false: SLM (sound Level Meters) determins the period of the sound in db SLP

Answer 23

False:

SLM determines the magnitude of the sound in db SLP

Question 24

Sound level meters are classified according to their accuracy. The lower the number, the more accurate the sound level meter is. True or false

Answer 24

True

Question 25

A type 1 sound level meter is less accurate than a TYPE II sound level meter. TRUE OR FALSE

Answer 25

False

Question 26

Which weighting scale is the most like human hearing?

Answer 26

A

Question 27

Which of the following reference scales is used to measure sound in the environment:

a) dB IL
b) db SPL
c) dB HL
d) dB sL
e) dB IL

Answer 27

b) db SPL