chp 2+8

Question 1

Proton

Answer 1

positive +1 charge
- Mass = 1.67 x 10-27 kg

Question 2

Neutron

Answer 2

No change
- Mass = 1.67 x 10-27 kg

Question 3

Electron

Answer 3

Negative -1 charge
- Mass = 9.1 x 10-31 kg

Question 4

Which particle can create a flow of electricity?

Answer 4

Electron

Question 5

PD of AA and AAA batteries

Answer 5

1.5 but AA is stronger

Question 6

Name 3 things needed for sound

Answer 6

medium, sound, receiver

Question 7

Formula to find speed

Answer 7

V=s/t (speed m/s=distance/t)

Question 8

How to turn m/s to km/h

Answer 8

Multiply by 3.6

Question 9

RO in ropec

Answer 9

Organize data

Question 10

P is ropec

Answer 10

The change (interpret) formulas

Question 11

EC in ropec

Answer 11

Final answer + working out

Question 12

What is a vibration

Answer 12

A movement around a fixed point, to and fro movement

Question 13

The displacement from the neutral position is called …….

Answer 13

amplitude

Question 14

Amplitude

Answer 14

the maximum displacement with respect to the equilibrium (neutral) position
- meauserd in dB
- the bigger the amplitude the louder the sound

Question 15

Wavelength

Answer 15

the distance between identical points in the adjacent cycles of a waveform
- The bigger the wave length the lower the pitch

Question 16

Frequency

Answer 16

number of oscillations / second
- A higher frequency results in a higher pitch
- measured in Hz

Question 17

Formulate the formula for frequency, using cycle time

Answer 17

f = 1/T

Question 18

Formulate the formula for cycle time, using the frequency

Answer 18

T=1/f

Question 19

The frequency range for humans is?

Answer 19

20-20,000 Hz

Question 20

oscillations

Answer 20

peaks

Question 21

Resistance

Answer 21

opposing force

Question 22

Electrical current

Answer 22

electrical flow

Question 23

How do the molecules move

Answer 23

• to +

Question 24

Attract vs repel

Answer 24

-/+ attract (pull)
+/+, -/- repel (push)

Question 25

3 conditions needed for a good circuit

Answer 25

1) closed circuit 2) Conductor 3) energy supply

Question 26

Load

Answer 26

device

Question 27

Conductor

Answer 27

something that loosely hold electrons (allows energy to go thru it)

Question 28

Insulator

Answer 28

Holds onto the electrons, more slow and resist the flow of the current (doesn't allow energy to pass through)

Question 29

Atomic forces

Answer 29

Force between atom x molecule

Question 30

Potential difference

Answer 30

a measure of energy, per unit of charge, transferred between two points in a circuit.

Question 31

Electromotive force

Answer 31

equal to the terminal potential difference when no current flows.

Question 32

Explain what happens from battery to a current

Answer 32

in the battery there are cells that push electrons to one side (pd), the pd provided by a cell is the emf. EMF makes electrons move more causing a current

Question 33

Short circuit (effects + meaning)

Answer 33

Curcuit with no loads, - drains battery quickly - heats up quickly - can cause you to be electrocuted

Question 34

Conservation energy law

Answer 34

Energy can be transformed into another sort of energy but it cannot be crated/destroyed

Question 35

Ammeter

Answer 35

- series - ampere

Question 36

Voltmeter

Answer 36

- parallel

Question 37

Where does sound travel the quickest and why

Answer 37

solid bc molecules are closer together (water,gas)

Question 38

Vacuum

Answer 38

- has no particles - cannot hear any sound

Question 39

How much does sound travel

Answer 39

340 m/s

Question 40

The higher the frequency...

Answer 40

the higher the periodic time