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Flashcards in Physics Deck (38):
1

What are longitudinal waves

That particles vibrate back and forth, so the direction of their movement is parallel to the direction of the wave eg sound waves

2

What is a transverse wave

In a a transverse wave, the particles move up and down so the direction of their movement is at right angles to the direction of the wave eg water and light waves

3

What is frequency

Frequency is the number of waves passing any point each second

4

What is current

Current is a measure of the rate of flow of electric charge in a circuit
How much is there

5

What is current measured in

Amperes

6

What is another name of potential difference

It is the same as voltage

7

What is potential difference

Potential difference is a measure of the different in electrical potential energy between two points in a circuit

8

What is voltage measured in

Volts using a voltmeter

9

What is a cell

A cell is an individual

10

What is a battery

More than one cell

11

The greater the electrical action demands....

The greater the current needed

12

Using more cells in a battery....

Increases the voltage

13

What is a series circuit

A series circuit has all of the components connected sequentially in a “loop”. If one part breaks the whole circuit will stop working.

14

What is a parallel circuit

A parallel circuit is a “branched circuit”. Meaning is has two ways for electricity to flow through. A break will stop that particular “break” from working. If their is a alternate complete path, then the electricity will flow through it.

15

What happens if you put soothing in a glass of water and look through the glass at it. Why does it look different?

The light has been refracted because it’s travelling through a different medium and is being slowed down by that particular medium therefor making the object appear different

16

What is a particle model

A model that can be used to explain the properties of solids, liquids and gases. In a solid the particles are packed closely together, the particles vibrate on the spot but hold shape. In a liquid the particles are packed closely together too but they are free to move and flow over each other. Particles in gases are not bound together at all and are free to move in a straight line until they hit another particle.

17

Define and insulator and compare it to a conductor

An insulator is a material that does not conduct heat well where as a conductor allows heat to flow through it. Ex of insulator, air, cloth, cork. Ex of conductors, metal

18

What is a sound wave

A sound wave is the movement of alternating compressions and rarefactions

19

What are compressions and rarefactions?

Compressions is a region of high pressure in which particles are close together and rarefaction is a region of low pressure in which particles are far apart

20

What is an electromagnetic wave

Transverse electric and magnetic fields position at right angles to each other and travelling through empty space at the speed of light

21

What electromagnetic radiation

Electromagnetic waves consisting of oscullating electric and magnetic fields travelling at the speed of light

22

Label and draw a diagram of a wave

Check answer

23

Compare frequency and pitch

Frequency is the number of waves passing any point
Each second (measured in hertz) whereas pitch is how low or high
A sound is. A source that vibrates rapidly creates a higher pitch sound than one that vibrates slowly.

24

Examples of radiation, convection and conduction

Radiation: the sun
Convection: boiling water or heating a room using a fireplace
Conduction: hot liquids make the cup itself hot or holding an ice cube

25

How is energy transferred through conduction and is it a particle or wave

particles in hot things vibrate faster so when something touches the heat, the particles start vibrating faster too.
A method of heat transfer in which heat is passed by vibration of particles.
It is a particle transfer

26

How is energy transferred through convection, particle or wave?

as the air is heated the particles gain energy and rise as the cool air sinks. As the cool air sinks it is heated by the heat source and rises leaving the cool air to be heated. This type of jets transfer can only happen in liquid and gases are their particles can move.
transfer of heat in liquid or gas due to less dense, warmer matter rising and dense, cooler matter falling
Particle transfer

27

How is energy transferred through radiation
Particle or wave?

radiation transmits waves through invisible electromagnetic waves that travel at the speed of light, everything gives off infrared radiation, the hotter the object the more radiation
movement of heat in the form of electromagnetic waves, which can travel through a vacuum
Wave transfer

28

How is energy transferred through sound
Wave or particle

Sound is created when something vibrates. When something vibrates it passes it vibrations into its surroundings. Sound waves travel away from the spice of sound (ripples in a lake)
The particles of the material vibrate as the sound energy flows through it.
It travels faster through solids than through gases as the particles are closer together transmitting the energy faster as they have less distance to travel to the next particle
Sound travels faster through warm things than cold things as the particles in warm things are already vibrating
Particle transfer

29

What is refraction

Refraction is bending of light as it passes from one substance into another substance
Light travels at different speed through difference substances, the difference in the speed results in different amounts of bending

30

How does a concave lens work

A concave lens’s is a lens that curves inwards
When parallel rays of light pass through a concave lens the refracted rays diverge so they appear to come from one point called the principle focus
A convex lens bulges outwards

31

What is the electromagnetic spectrum

The entire range of frequencies of electromagnetic radiation that can be produced, from high frequencies gamma rays to low frequency radio waves.

32

What does an electric circuit need

An energy source (cell, battery)
An energy user (bulb, light)
Wires to connect everything

33

What is the order of the electromagnetic spectrum

Gamma rays
X-rays
Ultra violet radiation
Visible light
Infrared radiation
Radio waves

34

What is resistance

A measure of how difficult it is for current to pass

35

What is resistance measured in

Ohms (the thing that looks like a horse shoe)

36

How does energy transfer through a circuit

light the flow of charge is made up of electrons moving along the wires. These electrons and the current they form, carry energy around the circuit from the battery or power point, to the different components that use it . All electrons flow along the circuit in the same direction.

37

Why does voltage drop when a wire is small and long

the resistance of a long wire is greater than the resistance of a short wire because electrons collide with ions more often. The resistance of a a thin wire is greater the resistance of a thick wire because a thin wire has fewer electrons to carry the current.

38

What is reflection, explain with a diagram

A bouncing os light off something without is being absorbed