# Sound Flashcards

1
Q

Waves

A

Vibrations set in motion

A way to transmit energy from one location to the next

2
Q

Wavelength

A

Distance between any two repeating parts of a wave

3
Q

Translational waves

A

Have crests and troughs (looks like normal waves)

4
Q

Compression waves

A

Need a medium to travel through like air or water

5
Q

Places where the waves are spread apart vs close together

A

Apart- ratification

Close- areas of compression

6
Q

Frequency

A

Number of wave cycles that pass any one point per second
Hertz=1 wave cycle per second
10 hertz= 10 wave cycles per second

7
Q

Wave speed =?????

A

Wave speed = wavelength x frequency

300m. = 100 m. x. 3 cycles

8
Q

A

300,000 km per second

9
Q

Speed of sound in air vs water

A

Air- 1,100 ft per second

Water- 4,500 ft per second

10
Q

Reflection

A

When a wave bounces off something

11
Q

Angle of incidence vs angle of reflection

A

Incidence is up top and reflection is bottom

12
Q

Refraction vs diffraction

A

R- the bending of a wave as it moves to one medium to another (straw in water looks demented bc light waves are going from air to water)

D-causes waves to spread out evenly when opening is the same size as wave length

13
Q

Constructive vs destructive interference

A

C- increase in amplitude when two waves come together

D- waves collide trough to crest and it cancels the amplitude out

14
Q

Doppler effect

A

Pattern of sound waves spread out & when the object making the sound is moving the waves are different (ambulance)

If plane goes faster than speed of sound it’s a bunch of circles sorta over lapping

15
Q

Boat example

A

V shape behind boat is constructive/destructive interference of waves

16
Q

Sonar

A

Sonar bonds depend of temperature of water

Submarines try to find thermal layers where sonar can’t go

17
Q

100 decibel

A

Damage to ears

18
Q

Amplitude

A

Half the height of a wave