physics test revision

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PHYSICS P1
PHYSICS P1
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which kind of waves can we use for cooking?
microwave
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how does cooking with microwaves work?
it works using infared waves
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what does 'SPF' mean?
sun protection factor
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why is SPF so important for your skin?
it stops your skin from burning
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what could happen if you don't wear sun cream in the sun?
you have a higher chance of getting skin cancer
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why is the hole in the ozone layer a problem?
harmful radiation can get through
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how can you stop the hole in the ozone layer increasing in size?
stop creating greenhouse gases
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descibe how p-waves and s-waves are different?
p-waves can travel through solid things such as rock whereas s-waves can't go through things so it has to go around causing it to take longer
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draw an analogue signal
mobile phone
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draw a digital signal
easy to communicate with other people
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give an example of wireless technology
mobile phone
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give one advantage of wireless communication
easy to communicate with other people
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give one disadvantage of wireless communication
the message can be distorted
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what is an earthquake?
when two tectonic plates smash into each other
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a loudspeaker gives out a frequency of 80Hz. what does 80Hz mean?
this means 80 waves per second
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what is specific heat capacity?
it tells you how much energy stuff can store
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what is conduction?
conduction of heat is the process where vibrating particles pass on extra kinetic energy to neighbouring particles
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what is convection?
convection occurs when the more energetic particles move from the hotter region to the cooler region, and take their heat energy with them
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how does loft insulation help to keep your house insulated?
loft insulation, fibreglass 'wool' laid across the loft floor reduces conduction through the ceiling into the roof space.
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how does insulating your house help?
insulating your house saves energy and money
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how does double glazing help to keep your house insulated?
double glazing, two layers of glass with an air gap to reduce conduction
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how does thick curtains help to keep your house insulated?
thick curtains, reduce conduction and radiation through the windows
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what happens to a wave when it is diffracted
the waves spread out at the edges when they pass through a gap or pass an object
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what happens to a wave when it is refracted
changing the speed of a wave can also change the direction
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what happens to a wave when it is refracted
changing the speed of a wave can also change the direction
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list the seven types of electromagnetic waves in order of wavelength (smallest to largest)
radio waves, microwaves, infa red, visible light, ultra violet, x-rays, gamma rays
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explain why Morse code is a digital signal
the Morse code is a type of digital signal because the light pulse is either 'on' or 'off'
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describe how light signals can travel through optical fibres
they work by bouncing waves off the sides of a very narrow core which is protected by outer layers. the ray of light enters the fibre so it hits the boundary between the core &the outer cladding. the pulse of light enters at one end &is reflected aga
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explain the properties of a laser beam
lasers produce narrow, intense beams of monochromatic light. all the waves in a laser are at the same frequency, the light waves are all in phase with each other meaning the troughs and crests line up and, lasers have a low divergence meaning the bea
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describe how lasers are used in CD players
a laser is shone onto the CD and is reflected from the bottom surface as it spins around in the player. the differences formed by a pit and a land are then changes into an electrical signal. an amplifier and loudspeaker then convert the electrical s
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name 2 types of waves produced by earthquakes
p-waves and s-waves
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why are CFC's so bad?
CFC's cause the earth's ozone layer to become thinner and once the ozone layer breaks it can let through harmful radiation
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where is the hole in the ozone layer?
the hole in the ozone layer is located in the Antarctica
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give two advantages of DAB
DAB suffers less interference than traditional radio broadcasts, because of the multiplexing it means an increase in the potential number of radio stations available
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give two disadvantages of DAB
at the moment there are a limited number of DAB transmitters in the UK so some areas can't receive digital radio signals at all. also the sound quality of DAB isn't often as good as traditional radio FM
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what does 'DAB' stand for?
Digital Audio Broadcasting
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what are the 4 key words that make the world?
solid inner core, liquid outer core, mantle and crust
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Other cards in this set

Card 2

Front

which kind of waves can we use for cooking?

Back

microwave

Card 3

Front

how does cooking with microwaves work?

Back

Preview of the front of card 3

Card 4

Front

what does 'SPF' mean?

Back

Preview of the front of card 4

Card 5

Front

why is SPF so important for your skin?

Back

Preview of the front of card 5
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