Module 3: Acoustics in Biology

Question 1

Intensity formula (classical)

Question 2

Intensity formula (pressure amplitude)

Question 3

Relationship of sound intensity and distance from the sound source formula

Question 4

Decibel is a more preferred way of describing sound loudness or softness, why is this?

Answer 4

Takes into account the human’s threshold of hearing

Question 5

I to dB formula

Question 6

What is the threshold of hearing in W/m2, dB?

Question 7

Which sound weighting is more reflective of the human hearing?

Question 8

Which sound weighting is more reflective of the true (unweighted) overall pressure level?

Question 9

hearing frequency range of human

Answer 9

20Hz - 20, 000 kHz

Question 10

What is the safe sound range?

Answer 10

less than or equal to 70dB

Question 11

sounds lower than 20 Hz

Answer 11

infrasound

Question 12

sounds higher 20, 000 kHz

Answer 12

ultrasound

Question 13

Perception of frequency, intensity

Answer 13

pitch, loudness

Question 14

Vibrations in the ____ causes depolarization of hair cells in the organ of ____.

Answer 14

endolymph; Corti

Question 15

Neurotransmitter involved in the perception of sound (hearing)

Answer 15

glutamate

Question 16

An acoustic strategy for organisms in locating their prey; applied in sonars and radars

Answer 16

echolocation

Question 17

non invasive medical procedure utilizing sound to visualize structures within the human body

Question 18

other applications of acoustics

Answer 18

acoustic tweezers; acoustic levitation, no contact cell moving and sorting