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Physics 2
Fichas del conjunto (36)
- 1How was the plum pudding model in 1897 seen to have looked?Electrons were seen to have been randomly distributed in a sphere of positive charge.
- 2How was the alpha scattering experiment done?Ernest Rutherford, Hans Geiger and Ernest Marsden investigated the scattering of alpha particles by sending them through a thin piece of foil (gold).
- 3How was the alpha scattering experiment measured?They measured the number of aparticles deflected per second at different angles.
- 4What results of the Alpha scattering experiment show?The results showed that most of the alpha particles passed straight through, however some bounced back. The number of alpha particles deflected per minute decreased as the angle of deflection increased. About 1 in 1000 alpha particles deflected per minute were deflected by more than 90 degrees.
- 5What did the alpha scattering experiment prove?It proved that the must be something more dense in an atom, which is a nucleus.
- 6What did they deduct about the nucleus?It’s positively charged because most alpha particles are repelled. The nucleus is much smaller than the atom because most alpha particles passed through without deflection.(the nucleus in diameter is 100,000 times smaller than the atom) It’s where most of the mass of the atom is located.
- 7What are the 2 main types of radiation?Infrared radiation (with heat) Ionising radiation.
- 8What is Ionising radiation?When an alpha particle zooms past a negatively charged electron, It gets attracted and rips off the electron from the atom. However the electron doesn’t join the alpha partical because it moves to quickly. The atom then becomes charged because the total amount of positive particles no longer equal the amount of negative particles so the charge is unbalanced. We now call the atom an ion.
- 9What is an isotope?When an element has the same number of protons but a different number of neutrons
- 10What kind of radiation is the most ionising?Alpha radiation
- 11What can beta penetrate?Air and paper
- 12What can beta be stopped by?A thin piece of aluminium
- 13What can gama penetrate?Air, paper, thin metal
- 14What can gama be stopped by?Concrete or lead
- 15What can alpha penetrateLeast penetrating, air
- 16What can alpha be stopped byabsorbed by a hand
- 17Which type of radiation is the most penetratingGama
- 18Why are Beta and Alpha particles deflected by electric fields, but gamma is not?Because Alpha particles are positively charge, therefore will attract to the negatively charged plate. Beta is negatively charged so will attract to the positively charged plate. Gama is neutral so is not deflected
- 19What happens when alpha and beta radiation are deflected in a magnetic field?They experice a deflecting force provided their motion is not parallel to the field
- 20If a star is 30X the mass of our sun, what will it end up as?A black hole
- 21What’s the life cycle of a star which includes our sun?1) protostar
2)Main sequence star
3)red giant
4)white dwarf
5)black dwarf - 22What’s the life cycle of a star which includes our sun?1) protostar
2) main sequence star
3)red super giant
4) super nova
5)black hole 5)neutron star - 23What do the control rods in nuclear fission do?Absorb extra neutrons to keep the chain reaction stable
- 24How does nuclear fission take placeA neutron is absorbed by a nucleus (uranium). The atom becomes unstable and splits in two. It releases lot’s of energy and 2-3 electrons. The energy is used to heat up water or gass. The water turns to steam, it drives the turbine and generator to make electricity.
- 25What is acceleration?The change of velocity per second (v=u+at)
- 26What is deaccelerationnslowing down
- 27What is the limit of proportionality?When a spring is perminently damaged and will not go back to it's original length
- 28Define thinking distanceThe distance travelled in the time taken to react
- 29Define breaking distanceThe distance travelled while breaks are being applied
- 30Define stopping distance?Theo outcome of both thinking distance and stopping distance
- 31What affects thinking distance?Alcohol and other drugs, being distracted (phone talking to someone)
tiredness - 32What affects braking distance?Road conditions
Car conditions (breaks tyres)
speed - 33What are the forces opposing driving force?Air resistence
Friction
Breaking force - 34What is conservation of momentum?In a closed system the total momentum before equals the total momentum after
- 35What is momentum?Property of a moving object
- 36What is the product of mass and velocity?Momentum
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- Fichas sobre Physics 2, creado por Bella Evershed el 15/02/2017.
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- Bella Evershed
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