sound waves

Question 1

what is the definition of a wave

Answer 1

• a disturbance that travels through a medium

- carry energy

Question 2

what are the 4 characteristics of a wave

Answer 2

• how they propagate
• amplitude
• frequency
• wavelength

Question 3

what are the 2 types of propagation waves

Answer 3

• transverse waves

- longitudinal waves

Question 4

what is a transverse wave

Answer 4

• propogates perpendicular to its meidum

Question 5

what is the highest peak of the wave called

Answer 5

crest

Question 6

what is the lowest valley called

Answer 6

trough

Question 7

what is a longitudinal wave

Answer 7

• propagates parallel to it’s medium

Question 8

what is it called when particles are close together in a longitudinal wave

Answer 8

compression region

Question 9

what is it called when particles are far apart in a longitudinal wave

Answer 9

rarefaction region

Question 10

what is the definition of an amplitude of a wave

Answer 10

maximum distance travelled by particles in the medium compared to its position at calm

Question 11

how do u measure amplitude for a transverse wave

Answer 11

position at calms to maximum crest or position at calm to lowest trough

Question 12

how do u measure amplitude for longitudinal waves

Answer 12

• measure the length of the are of compression

- higher the compression = higher the amplitude

Question 13

what is wavelength

Answer 13

length of waves complete cycle

Question 14

what is frequency

Answer 14

number of cycles per unit of time
measures in hertz Hz
- number of hertz = number of cycles completed in 1 sec

Question 15

what is the scale of hertz that humans can hear

Answer 15

20hz-20000hz

Question 16

what is an infrasound

Answer 16

sound less than 20hz

Question 17

what is an ultrasound

Answer 17

sound more than 20000hz

Question 18

what are the two types of waves

Answer 18

• mechanical

- electromagnetic

Question 19

what is a mechanical wave

Answer 19

• waves that require a medium to move

- cause a disturbance that changes the medium

Question 20

what is an example of a mechanical wave

Answer 20

sound waves

Question 21

what are mediums

Answer 21

solid
liquid
gas

Question 22

what is an electromagnetic wave

Answer 22

• travel in medium and vacuum

Question 23

what is an example of an electromagnetic wave

Answer 23

radio waves, light waves

Question 24

what are the characteristics of a sound wave

Answer 24

• longitudinal wave
• mechanical wave
• can move through solids, liquids. gases

Question 25

what is the process of a sound wave being created

Answer 25

1. disturbance is caused in the environment
2. disturbance is then passed on to the surrounding medium
3. then the wave transmits energy

Question 26

what does the speed of sound depend on

Answer 26

• depends on the medium which the sound is travelling through
• more matter = FASTER

Question 27

what medium does sound travel the fastest through

Answer 27

solids because they have the most matter

Question 28

what is the decibel scale

Answer 28

• represents the intensity of sound by the human ear
• symbol is Db
• intensity is referring to how much energy the wave is carrying
• the scale goes by 10x

Question 29

how much louder is 50 dB from 20dB

Answer 29

1000X louder

Question 30

what is the maximum dB that humans should not listen to

Answer 30

sounds over 100db