Light
Sound
Energy Transfer
Electrical Circuits
Diagrams
Energy Transformation
Energy Efficiency
Heat Transfer
100
What is the speed of light in a vacuum?
299,792km/s
100
What causes sound?
Vibrations
100
What is energy transfer?
When energy moves from one object to another without changing form
100
What is electricity?
The flow of electrons
100
Suggest potential forms of energy that might be considered losses.
Sound, Light.
100
What is energy transformation?
When energy changes from one form to another.
100
What is energy efficiency?
A measure of how much input energy is converted to useful output
100
Name the three methods of heat transfer
Conduction, Convection and Radiation.
200
Name two models we use to explain the behaviour of light.
Wave and Particle Model
200
Sound waves are this type of wave
Hint: Longitudinal or Transverse
Longitudinal
200
Give an example of Energy Transfer
Acceptable answers will vary
200
What is Voltage?
The amount of energy supplied or used, measured in volts
200
What is the wavelength of green light in nanometre?
500-565
200
What is the main energy transformation in a toaster?
Electrical to Heat
200
What is the formula for energy efficiency?
(useful energy / total energy input) x 100
200
What is conduction
Transfer of Heat through direct contact.
300
What is refraction?
The bending of light as it passes from one medium to another
300
Does sound travel faster in solids or gases?
Solids
300
What kind of energy transfer occurs when you hold an ice cube?
Thermal Energy transfer from hand to cube
300
What does an ammeter measure?
Electric current
300
What wavelengths does the visible light spectrum exist in?
380-750 nm
300
In a light bulb, what forms of energy are produced?
Double points for identification of useful/wasted energy.
Light (useful) and Heat (wasted)
300
A machine uses 1000 J and produces 400 J useful energy. What is its efficiency?
40%
300
What is convection?
Transfer of heat via movement in fluids
400
What type of mirror makes things look larger and is used in carparks and car side mirrors
Convex Mirror
400
What unit is used to measure frequency?
Hertz (Hz)
400
What stays the same during an energy transfer?
Type of Energy
400
What unit is resistance measured in?
Ohms
400
Name two similarities between AM and FM radio waves.
Both artificial, both caused by vibrations, both have own carrier wave frequency, both have a change in the original signal.
400
What kind of energy does a blender use/create?
Electrical transformed to kinetic, sound, and heat
400
What is the name of the following diagram.
Sankey Diagram
400
What is radiation?
Transfer of energy via electromagnetic waves
500
What happens to light when it hits a black object
It is absorbed
500
What is changed when the amplitude of a sound wave is changed?
The loudness or volume
500
Name a device where energy is transferred but not transformed.
Metal rod conducting heat.
500
In a series circuit, what happens if one bulb blows?
All bulbs go out
500
Name two differences between AM and FM radio waves.
Options will vary.
500
name the energy transformation in a speaker.
Electrical to sound.
500
What type of energy is commonly wasted in machines?
Heat or Sound
500
Which surfaces absorb radiant heat best?
Dark, matte surfaces
600
Name the part of the electromagnetic spectrum that is visible to humans.
Visible Light
600
Can sound travel through space?
Double points for why/why not.
No, because it is a vacuum
600
in conduction, how is energy transfered?
Through direct contact between particles.
600
Name the parts in the circuit below.
Battery, Switch and Bulb
600
What is the wavelength of a longitudinal wave?
The distance between the centre of the compressions or the distance between the peaks of the wave.
600
What energy transformation occurs when riding a bike?
Chemical (body) to kinetic, sound, heat
600
Is it possible for any device to be 100% efficient?
No, some energy is always lost
600
Why are metals good conductors?
Free-moving electrons transfer energy easily
700
What is a photon?
A particle of light
700
Which part of a wave has the highest pressure?
Hint: Compression or Rarefaction
Compression
700
What is convection?
Transfer of Heat through fluids due to particle movement.
700
Name a good electrical conductor
Any metal or metal in general
700
Describe what a rarefaction is.
The periods of lower pressure in a wave or the space between the compressed parts of the wave.
700
What does the Law of Conservation of Energy state?
Energy cannot be created or destroyed, only transformed or transferred
700
A heater uses 2000 J and produces 1600 J heat. What is the efficiency?
80%
700
What does insulation do?
Reduces heat transfer