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Flashcards in sound, light, and electricity test Deck (44):
1

what is sound?

types of waves

2

what is a wavelength?

distance from identical parts of a wave

3

what is an amplitude?

height of a wave from the rest positionq

4

what is frequency?

number of complete waves that pass a fixed point in a given time (change in pitch)

5

what is reflection?

when a wave strikes a surface and bounces off of it

6

what is refraction>

the bending of wabes as they enter a new medium-bending occurs due to the chanfe of speed in the wavee

7

what is diffraction?

change in behavior of a wave as it encounters obstacles

8

what is the doppler effect?

the apparent change in frequency of a wave as the source moves in relation to the observer *move by ear*

9

what is resonance?

when an oject is struckby a wave that matches it's natural frquncy, the object will vibrate

10

what is the perception of sound?

the distance from the source, or amount of energy required

11

what is intensity?

the amount of energy a sound wave carries per second through a unit area

12

what is pitch?

how high or low a sound seems to an observer

13

what are photons?

"packets" of light energy

14

what is a particle model?

when light shines on surfaces, electrons on that surface became "excited"

15

what is a wave model?

waves of light travel as two interlocking transverse waves at 90 degree angles to each other (polarized filters)

16

what is the photoelectric efffect?

-discovered by Einstein
-when light hits a substance, the electrons can become so "excited" that they are essentially kocked off of the substance

17

what is electricity?

a flow of electrons from place place

18

what is a gradient?

a difference in concentration of something

19

what is a current?

continuous flow of electrons, measured in amps

20

what is voltage?

the difference in electrical potential in a circuit, measured in volts (also called potential difference)

21

what is resistance?

opposition to the flow of a current, measured in ohms

22

what is ohms law?

v = i x r

23

types of circuits?

series, parallel, complex

24

what is a series circuit?

only 1 continuous path for electricity to travel

25

what is a parallel circuit?

multiple paths for electricity

26

factors affecting resistance?

-diameter of wire
-length of wire
-temp. of wire
-type of wire

27

what is the series circuit equation?

Rt= R1+R2+R3

28

what is the parallel circuit equation?

Rt+ 1/ ( 1/R + 1/R + 1/R)

29

in a series circuit, what is constant?

current

30

in a parallel circuit, what is constant?

voltage

31

who was luigi galvani?

1780, researched frogs
-galvani was dissecting a frog on a table, and there was a spark

32

who was alessandra volta?

took galvani's research to make the first battery

33

what was the first battery made from?

volta layered zinc, paper soaked in salt water, and silver

34

what is an electrade?

piece of metal sitting in an electrolyte

35

what is an electrolyte?

a substance, liquid or paste, that conducts electric current

36

what is a terminal?

the part of the electrolyte that sticks out of the electrolyte

37

what is a battery?

a combination of 2 or more electrochemical cells

38

what are wet cells?

when the electrolyte is a liquid

39

what are dry cells?

when the electrolyte is a paste

40

what does electricity follow?

the path of least resistance

41

what is static electricity?

when electric charges build up on the surface of an object
called "static" because the charges don't flow (no current)

42

what is friction?

when 2 uncharged objects rub together creating a charge on 1 of the objects

43

what is conduction?

when a charged (static discharge) object transfers charge to another by direct contact

44

what is induction?

when the electrons in a charged object move because of the electric field of another object