Immitance

Question 1

define immitance

Answer 1

how well energy flows through a system
acoustic immittance- specific to acoustics

Question 2

define impedance

Answer 2

Opposition to the flow of energy (how well it doesn’t flow)

Question 3

define admittance

Answer 3

Ease with which energy flows through a system (how well it does flow)

Question 4

Hearing range curves - why we have that shape on curve

Answer 4

ossicle size

Question 5

How many components does immitance have?

Answer 5

3 (2 frequency dependent one not)

Question 6

What are the 3 immitance components and which are frequency dependent and frequency independent

Answer 6

Mass reactance
opposition to high frequency motion
Stiffness reactance
opposition to low frequency motion
Resistance
Opposition to energy flow
Frequency independent ((neutral; same at all frequencies)

Question 7

large mass

Answer 7

opposes high frequency because it cannot vibrate fast

Question 8

small mass

Answer 8

opposes low frequency because it cannot vibrate slow

Question 9

large stiffness

Answer 9

opposes low frequencies because it cannot vibrate slowly

Question 10

Will increasing mass make an object vibrate more slowly or more quickly?

Answer 10

more slowly

Question 11

Will increasing stiffness make an object vibrate more slowly or more quickly?

Answer 11

more quickly

Question 12

Explain why smaller animals have better high frequency hearing, based on ossicle size.

Answer 12

they have better high frequency hearing because they have smaller ossicle size so they vibrate faster, less opposition (resistance) to high frequency vibration

Question 13

Select one: broadly tuned/narrowly tuned systems are efficient sound transducers.

Answer 13

broadly tuned

Question 14

Which is better at sound transducer?

Answer 14

broadly tuned system

Question 15

would it be preferred to listen out of a small speaker or a movie theater?

Answer 15

movie theater because it is more broadly tuned system

Question 16

What gives us a low frequency hearing loss?

Answer 16

ossicular adhesions, unequal pressure on both sides of tm, fluid in ears because it has an increase in mass

Question 17

what gives us a high frequency hearing loss?

Answer 17

Thickening of the tm
Mass in ME or EAC
Pus, blood, or serous fluid in the middle ear
Many otitis media cases begin as stiffness factors and move to mass factors
Earplug in ear canal!
because it causes an increase in mass and decrease in stiffness

Question 18

What influence do stiffness and mass have on the characteristics of typical human hearing?

Answer 18

they have an equal influence = no influence

Question 19

What kind of hearing loss would result from an increase in stiffness?

Answer 19

low frequency hearing loss

Question 20

What kind of hearing loss would result from an increase in mass? What is the one example you should remember from the list of examples?

Answer 20

high frequency hearing loss
earplug stuck in the ear canal

Question 21

What kind of hearing loss would you see with impacted cerumen?

Answer 21

high frequency hearing loss because there is an increase in mass?