Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

EK physics > Chapter 5 > Flashcards

Chapter 5 Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Electromagnetic waves

A

do not require a medium to travel through

includes light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Mechanical wabes

A

require a medium to travel through

includes sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

transverse wave

A

medium is displaced perpendicularly to the direction of wave propagation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Longitudinal wave

A

sound, medium is displaced parallel to the direction of wave propagation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

velocity of wave

A

distance the wave travels per unit of time

v= F (wavelength)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

wavelength

A

lambda, distance from any point in the wave to the point where the wave begins to repeat itself

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

frequency

A

number of wavelengths that pass a fixed point in one second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Period

A

T, time it takes the wave to travel the distance of one wavelength

T=1/f

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What affects the velocity of a wave?

A

The characteristics of a medium (inertia and elasticity)

Decrease inertia, increase in elasticity will increase velocity

(Increase in IMF, decrease in mass)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Elasticity of medium

A

ability of medium to move back to original shape

more elastic means faster velocity as waves are pushed along

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Inertia of medium

A

mediums resistance to motion, more resistance means the wave is slowed down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How does velocity of waves change is solid, liquid, and gas

A

V solid> V liquid> V gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why do sound waves travel faster in water than in air

A

water is denser, but has more bulk (more elasticity)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

amplitude

A

distance between the X axis and the top of crest or bottom of trough

Always positive

Changes as the wave changes mediums

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Constructive interference

A

sum of displacements combine to create a greater displacement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

destructive interference

A

sum of displacements results in a smaller displacement

17
Q

Phase

A

determines what type of interference will occur

18
Q

in phase

A

two waves with same wavelength and begin at the same point and time

19
Q

out of phase

A

two waves that have the same wavelength but travel different distances to arrive at the same point

20
Q

Sound

A

transfer of energy through oscillations between high and low pressure

21
Q

When is sound audible

A

oscillations in certain frequency trigger electrical impulses to the brain

22
Q

pitch

A

how high or low a note sounds, corresponds to frequency

23
Q

Power of a wave

A

rate at which a wave transfers energy

P= delta E over time

measured in intensity

24
Q

intensity

A

average rate of energy transfer per unit area

25
Q

What affects wave intensity

A

density of the medium, wave frequency, wave velocity

Frequency and amplitude have largest affect (squared)

26
Q

Intensity level

A

level of loudness
ß= 10 log (I/I0)

in decibals

I0 is the intensity threshold for human hearing

if intensity factor increases by 10, the decibals increase by 10

27
Q

Human threshold of hearing

A

10^-12vW/M^2

20-20,000 HZ

28
Q

Ultrasonic waves

A

frequency above human hearing

US uses high frequency sound waves

waves reflect off boundaries and cause vibrations and current which is processed

intensity of waves shows density

29
Q

resonance

A

natural and driving frequency are equal

30
Q

attenuation

A

dampening, decrease in intensity of wave moving through a medium

Bone is denser- waves are reflected in US

31
Q

Doppler effect

A

change in perceived frequency when a wave source and observer move towards or away from eachother

observed> source when moving toward

32
Q

What happens to sound when moving towards source

A

distance travelled by wave is lesser

observer perceives a higher frequency

33
Q

What causes beats

A

two waves with slightly different frequencies are superimposed

alternate constructive and destructive

34
Q

Beat equation

A

F beat= |F0 - Fs|

35
Q

Shock wave

A

conical wave produced when the velocity of the sound source exceeds the velocity of the sound wave

use mach number

36
Q

Mach number

A

Vs/v

increases as the velocity of sound source increases

37
Q

sonic boom

A

created by shock wave, as the wave fronts overlap a region of low air pressure forms

EK physics (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions