chapter 16 sound

Question 1

why cant we hear the sound made in space?

Answer 1

sound only travels in matter and it space, there is no matter or air surrounding therefore sound cannot be heard

Question 2

what matter does sound travel fastest in and why?

Answer 2

sound travels fastest in solid. when the molecules start to vibrate at one end, the energy is transferred to the neighbouring molecules quickly as the molecules are packed very closely together

Question 3

what is the speed of sound in solids, liquids and gas?

Answer 3

solids: 5000m/s - 6000m/s
liquids: 1500m/s
gas: 330 m/s

Question 4

what is the external ear and what is its function?

Answer 4

a cup like flap that collects sound

Question 5

what is the ear canal and what is its function?

Answer 5

it is a tube that channels the sound to the eardrum

Question 6

what is the ear drum and what is its function?

Answer 6

a skin flap that vibrates according to the sound coming in

Question 7

name the three bones in the ear after the eardrum and its function.

Answer 7

the hammer, anvil, stirrup then transfers the vibration to the inner ear

Question 8

what is the cochlea and what is its function?

Answer 8

its a shell shaped chamber which vibrates according to the different frequencies

Question 9

what is the function of the ear nerve?

Answer 9

receives electrical signals from the vibrations of the cochlea and send a signal to the brain which then interprets the sound

Question 10

what is frequency?

Answer 10

the number of cycles per second made by the vibrating source of sound is called the frequency of the sound

Question 11

what are the uses of sound?

Answer 11

entertainment, warning of danger and communication

Question 12

what is sonar and what is is used for?

Answer 12

a technique that uses sound to gather information about the environment. can be used for providing information about underwater conditions and objects surrounding the ship

Question 13

what is ultrasound and what is is used for?

Answer 13

a sound that with frequencies above 20,000 Hz which cannot be heard by the human ear. used to observe the internal body without the need for operation: like observing fetuses inside a pregnant mother.

Question 14

what is noise and what is it measured in?

Answer 14

noise is a collection of unpleasant notes that is unpleasant or may even be harmful. decibels (dB)