What does mechanical mean in terms of waves?
Requires a substance to travel e.g. air particles
Produced by a machine
Waves can be...
Reflected, refracted and diffracted
Reflected, diffused and compressed
Diffracted, reacted, and rarefacted
Bent, Bounced and Spread out
What type of EM wave is used to see broken bones?
When light hits a shiny planar surface the path of light leaving the surface is called the...
Heat can be transferred as what kind of light?
Which type of EM wave can be used for communication on an FM or AM frequency?
The process where hot particles rise, and cool particles sink is called what?
What is conduction?
The transfer of energy through a solid substance
The way an orchestra is led
The transfer of electricity through a wire
Which of these is not included in Newton's colour wheel?
Coal and oil are the only fossil fuels used for electricity.
Convection is the transfer of heat through a fluid
What three ways can heat be transferred?
What is this showing?
What is unsustainable energy?
Very inefficient energy.
An energy source that will run out.
An energy source that doesn't last very long.
When too much energy is used.
What is the unit of measuring frequency?
When a spring is stretched out, gravitational potential energy is stored in the coils.
What are the two types of diagrams used when describing energy in an appliance?
What types of surfaces are the best emitters of radiation?
Why are metals good electrical conductors?
Because they are solids.
Because they have free electrons.
Because they have free ions.
Because they are dense.
Gamma rays have a wavelength between 10^-12 and 10^-15 m.
What surfaces absorb each better?
What surfaces reflect heat better?
What are the three standard states of matter?
What unit do we use to measure force?
Hz x m
Hz / m
m / Hz
m x s
m / s
How many volts are in the mains supply in the UK?
How do you calculate the energy required to heat up a substance?
E = m c θ
E= (m c) / θ
E = m / (c θ)
What colour is the back of a solar panel and why?
Black, because it absorbs heat.
Black, because it emits heat.
Shiny silver, because it reflects the heat back in.
Copper, because copper is a good conductor of heat.
Surfaces that are matte appear shiny when light is shone on them.
Sound travels in longitudinal waves.
A radio transmitter can send a strong signal through a hill.
when waves pass through a gap and spread out.
when waves pass through a gap and change direction.
when waves meet a gap and are reflected back instead of passing through.
What is evaporation?
The process of a liquid becoming a gas.
The process of a solid turning straight into a gas (missing out the liquid phase).
When a gas becomes a liquid.
Which of these is the right wavelength for a radio wave?
The best conductors are...
dense solid substances.
most metals and some solutions.
A solar eclipse happens when...
the Earth passes between the Sun and the Moon.
the Moon passes between the Sun and the Earth
the Sun passes between the Moon and the Earth
The relationship between wavelength and frequency is...
What is payback time?
The amount of time needed to earn back the cost of an object from how much it saves per year.
The amount of time that an energy saving installation is effective for.
The amount of time a power station needs to run for to meet the demand of the National Grid.
There are 7 colours on Newton's colour wheel.
A new door costs £200. It saves £25 on heating bills every year. How long is the pay back time?
A Sankey diagram shows you the most wasteful appliance in a household.
The transfer of heat through a fluid is known as convection.
Radio waves have the longest wavelength and the highest frequency.
What is refraction?
When a wave bounces off a surface and some is absorbed.
When a wave spreads out through a gap.
When a wave enters a different density and changes direction.
What is the job of the step down transformers in the National Grid.
To lower the voltage for home use.
To bring electricity down from the overhead cables.
To lower the current to a safe level.
Choose the types of energy sources that are renewable.
Wood is a renewable energy source.
What are two features of a longitudinal wave that do not occur in a transverse wave?
Compression and rarefaction.
Compression and refraction.
Concession and rarefaction.
An EM wave in a vaccum with a small wave length has what kind of frequency?
What is the name of the network that connects power to the homes and businesses in the UK?
National board of Electric and Power
Which of these is the correct formula (units only)
m/s=Hz x m
m/s=Hz / s
Hz= m/s / m
Gamma waves have the highest frequency of all the EM waves.
Select the limits of human hearing.
20 000 Hz
2 000 Hz
200 000 Hz
What unit do we use to measure energy?
What is the correct formula for calculating efficiency?
(useful energy out / total energy in) x100
(useful energy out x 100) / total energy in
(total energy in / useful energy out) x 100
(total energy in x useful energy out) / 100
What type of energy is contained within biomass?
What does a step up transformer do?
Particles vibrate and knock into the surrounding particles, transferring energy along. This is...
What is the frequency of the mains electricity in the UK?
What are the three types of ionising radiation in the EM spectrum?
Sound travels as a wave.
Sound waves are transverse
Sound waves are mechanical
What is the unit of measurement for frequency?
Why do objects appear smaller underwater?
P x t =
Why do animals in warm climates have big ears?
To hear predators coming from far away.
To increase heat loss (keep cool)
To appear taller and more intimidating
Select the ways of reducing heat loss in a home.
cavity wall insulation