Exercises - Form IV - WAVES - ACTIVITY 3

ACTIVITY 3

1.       (a) With examples distinguish between infrasonic and ultrasonic sounds.

(b) Mention any three sources of infrasonic and ultrasonic sounds.

2.       Briefly explain the mechanism of hearing.

3.       Give the function of each of the following.

a)       Pinna

b)      Three bones (hammer, anvil and stirrup)

c)       Eustachian tube

d)      Stirrup

e)      The fluid and nerves of semi-circular canals

f)        Auditory nerves.

4.       (a) Distinguish between Echo and reverberations.

(b) State the conditions for the Echo to be heard.