Paper 5:physics 1F

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What is the approximate value of the potential difference of the UK mains electricity supply?
230V
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Why are the wires in a 3 core cable in the UK always the same colours?
It is easy to identify each wire
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What is the approximate frequency of the UK mains electricity supply?
50Hz
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The nuclei of some isotopes are radioactive. What statement could apply to a radioactive nucleus?
The nucleus will emit a neutron
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When food is eaten, some of the radiation the food emits is detectable outside the body. Which type of radiation would not be detectable outside the body?
Alpha radiatiom
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What is the approximate size of a helium atom?
1 x 10 (-5 means power) m
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What is the difference between a helium atom and an alpha particle?
A helium atom has 2 electrons
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Why do scientists think that helium should not be used to inflate party balloons?
Helium will one day run out so there will be none left for medical research and it will be wasted
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What are 2 safety precautions to take when taking part in an an experiment?
Putting long hair up and wearing goggles
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A car manufacturer tests different heating elements by measuring how long it takes ice to melt. During the test some variables must be controlled. What are 2 control variables in the car manufacturers test?
The current in the heating element and the mass of ice
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Some of the energy supplied a car heater causes the ice to melt without the temperature of the ice increasing. What is the name of the energy supplied by the heater?
Latent heat of fusion
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If the resistance of the variable resistor is increased. What effect will this have on the lamp?
The lamp will be dimmer
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What is the equation to calculate the efficiency?
Output energy transfer/input energy transfer
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What is the equation that links current, potential difference and resistance?
potential difference = current x resistance
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What is the equation that links kinetic energy, mass and speed?
Kinetic energy = 1/2 x mass x velocity (squared)
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Why does having a more efficient motor increase the top speed of a toy car?
There is a lower proportion of waste energy and a higher proportion of energy is converted to kinetic energy.
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Other cards in this set

Card 2

Front

It is easy to identify each wire

Back

Why are the wires in a 3 core cable in the UK always the same colours?

Card 3

Front

50Hz

Back

Preview of the back of card 3

Card 4

Front

The nucleus will emit a neutron

Back

Preview of the back of card 4

Card 5

Front

Alpha radiatiom

Back

Preview of the back of card 5
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