Sound Ch 16: Review of roman numerals 3 and 4

Physical Science

Sound  Ch 16

Review of roman numerals 3 and 4

1.   If an auditorium is experiencing too much reflection, what might the owner choose to do?  How would this help?  The owner might want to add padding to the walls to absorb sound or add angles so that the sound reflects differently.

2.  What does this image represent in a sound wave?   It is three of the same note begin played in different octaves.

3.  What is the difference between noise and music?  Noises are random and music uses pitches whose waves are mathematically related.

4.   Explain in a sentence how musical sound waves are able to be interpreted as  music in our brain.  The outer ear funnel the sound wave to the eardrum.  The movement of the drum triggers 3 small bones to move which transfers the vibration to the cochlea.  The cochlea is full of fluid and 10,000 hairs.  These hairs are connected to nerve cells which turn the movement into electrical impulses which are sent to the brain.

5.  Draw an ear and label the ear drum, the 3 small bones (called Ossicles in the picture), and the cochlea. 

6.  Name 2 causes of hearing loss.   answers may vary,  two possibilities are sudden loud noises like a lightening strike or sustained moderately loud sounds like a blender

7.  What are two changes to a normal ear that are common and cause hearing loss?  a ruptured eardrum and dead hairs in the cochlea due to aging

8.  Explain what a hearing aid does (be specific and use information from our notes).  A hearing aid can either increase the amplitude of all frequencies or it can target only certain frequencies.

9.  Name one use of sound waves that is not for music or noise.  answer may vary, some possibilities are sonar and ultrasound