Edexcel iGCSE Physics Before Exam
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questions with answers |\ |\
Magnetic field around circular coil
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Magnetic field around solenoid
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Magnet vs magnetic material
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,Magnet produce magnetic field vs magnetic materials only
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produce field when put in field of magnet
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What would happen if circuit was near compass
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Electric current in conductor produces magnetic field magnetic
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field created around wire , magnetic compass needle moves to
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line up with field; magnetic field around coil
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Properties of alpha radiation |\ |\ |\
Most ionising - 2+ charge that attracts electrons in outer shell,
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ripping them off ; Least penetrating - Alpha particles are
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relatively large so cannot pass through many materials
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Properties of beta radiation |\ |\ |\
Medium ionising : high speed electrons that can collide with
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electrons in outer shell to rip them off ; Medium penetrating -
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Relatively low amss and size, and high speed
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Properties of gamma rays |\ |\ |\
Low ionising - doesn't have any mass or charge to rip off
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electrons ; Most penetrating - Doesn't have any volume or mass -
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passes through materials ; Can go through 金属
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,How is radiation used in thickness control
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What type of radiation is used in thickness control
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What half life is used for thickness control
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Source is positioned with detector on other side, too much
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radiation weakens roller so its thickens, not enough strengthens
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rollers so it gets thinner |\ |\ |\ |\
B - it is affected by thin material + ionising effect are easily
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detected, A would be absorbed, Y would all pass through
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Long half life - so it doesn't need to be replaced and no errors
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when it runs out |\ |\ |\
How is radiation used in food irradiation?
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What radiation is used in food irradiation?
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What is the half life of radiation used in food irradiation?
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food is exposed to low dose to destroy pathogenic
|\ |\ |\ |\ |\ |\ |\ |\ |\
microorganisms, higher doses can sterilise food. This preserves |\ |\ |\ |\ |\ |\ |\ |\
food without damaging it, reducing waste
|\ |\ |\ |\ |\
Gamma - Most penetrating - can penetrate food and all
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
packaging, least ionising - doesn't damage food |\ |\ |\ |\ |\ |\
3-5 years so they don't need to replenish supply
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, How radiation is used in tracers
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What radiation is used in tracers
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What half life is used in tracers
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Shows what product is where, substances accumulates where the
|\ |\ |\ |\ |\ |\ |\ |\
issue is, certain chemicals concentrate in different parts eg
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
iodine in thyroid |\ |\
Y+B - penetrating enough to exit patients body, A is not
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penetrating enough |\
Hours otherwise may cause damage after treatment
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How radiation is used in radiotherapy
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What radiation is used in radiotherapy
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What half life is used in radiotherapy
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Directing high does of radiation or internal implant - internal -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
radioisotope close to tumours, external - bombarding with |\ |\ |\ |\ |\ |\ |\ |\
gamma rays from outside |\ |\ |\
Internal : B, can kill tumour cells,. reaches whole of tumours but
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
not too far ; External : Y - Penetrating enough to reach inside
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body
Internal - Months so it is active through all treatment, not too
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long or may damage; External - 5 years so doesn't need to be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
replaced
|\ |\ |\ |\ |\
questions with answers |\ |\
Magnetic field around circular coil
|\ |\ |\ |\
Magnetic field around solenoid
|\ |\ |\
Magnet vs magnetic material
|\ |\ |\
,Magnet produce magnetic field vs magnetic materials only
|\ |\ |\ |\ |\ |\ |\ |\
produce field when put in field of magnet
|\ |\ |\ |\ |\ |\ |\
What would happen if circuit was near compass
|\ |\ |\ |\ |\ |\ |\
Electric current in conductor produces magnetic field magnetic
|\ |\ |\ |\ |\ |\ |\ |\
field created around wire , magnetic compass needle moves to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
line up with field; magnetic field around coil
|\ |\ |\ |\ |\ |\ |\
Properties of alpha radiation |\ |\ |\
Most ionising - 2+ charge that attracts electrons in outer shell,
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ripping them off ; Least penetrating - Alpha particles are
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
relatively large so cannot pass through many materials
|\ |\ |\ |\ |\ |\ |\
Properties of beta radiation |\ |\ |\
Medium ionising : high speed electrons that can collide with
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electrons in outer shell to rip them off ; Medium penetrating -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Relatively low amss and size, and high speed
|\ |\ |\ |\ |\ |\ |\
Properties of gamma rays |\ |\ |\
Low ionising - doesn't have any mass or charge to rip off
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
electrons ; Most penetrating - Doesn't have any volume or mass -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
passes through materials ; Can go through 金属
|\ |\ |\ |\ |\ |\ |\ |\
,How is radiation used in thickness control
|\ |\ |\ |\ |\ |\
What type of radiation is used in thickness control
|\ |\ |\ |\ |\ |\ |\ |\
What half life is used for thickness control
|\ |\ |\ |\ |\ |\ |\
Source is positioned with detector on other side, too much
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
radiation weakens roller so its thickens, not enough strengthens
|\ |\ |\ |\ |\ |\ |\ |\ |\
rollers so it gets thinner |\ |\ |\ |\
B - it is affected by thin material + ionising effect are easily
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
detected, A would be absorbed, Y would all pass through
|\ |\ |\ |\ |\ |\ |\ |\ |\
Long half life - so it doesn't need to be replaced and no errors
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
when it runs out |\ |\ |\
How is radiation used in food irradiation?
|\ |\ |\ |\ |\ |\
What radiation is used in food irradiation?
|\ |\ |\ |\ |\ |\
What is the half life of radiation used in food irradiation?
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
food is exposed to low dose to destroy pathogenic
|\ |\ |\ |\ |\ |\ |\ |\ |\
microorganisms, higher doses can sterilise food. This preserves |\ |\ |\ |\ |\ |\ |\ |\
food without damaging it, reducing waste
|\ |\ |\ |\ |\
Gamma - Most penetrating - can penetrate food and all
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
packaging, least ionising - doesn't damage food |\ |\ |\ |\ |\ |\
3-5 years so they don't need to replenish supply
|\ |\ |\ |\ |\ |\ |\ |\
, How radiation is used in tracers
|\ |\ |\ |\ |\
What radiation is used in tracers
|\ |\ |\ |\ |\
What half life is used in tracers
|\ |\ |\ |\ |\ |\
Shows what product is where, substances accumulates where the
|\ |\ |\ |\ |\ |\ |\ |\
issue is, certain chemicals concentrate in different parts eg
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
iodine in thyroid |\ |\
Y+B - penetrating enough to exit patients body, A is not
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
penetrating enough |\
Hours otherwise may cause damage after treatment
|\ |\ |\ |\ |\ |\
How radiation is used in radiotherapy
|\ |\ |\ |\ |\
What radiation is used in radiotherapy
|\ |\ |\ |\ |\
What half life is used in radiotherapy
|\ |\ |\ |\ |\ |\
Directing high does of radiation or internal implant - internal -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
radioisotope close to tumours, external - bombarding with |\ |\ |\ |\ |\ |\ |\ |\
gamma rays from outside |\ |\ |\
Internal : B, can kill tumour cells,. reaches whole of tumours but
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
not too far ; External : Y - Penetrating enough to reach inside
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
body
Internal - Months so it is active through all treatment, not too
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
long or may damage; External - 5 years so doesn't need to be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
replaced
