Flashcards
Matter and Radiation flash cards
Cards in this deck (16)
- 1What is a isotopeisotopes are atoms with the same number of protons but different number of neutrons.
- 2define specific chargecharge divided by its mass
- 3what is the strong nuclear forceovercomes electrostatic forces of repulsion between protons in the nucleus
- 4at what distances does the strong nuclear force workrange of no more than 3-4 fm
is attractive force at 3-4 fm down to 0.5fm. at separations smaller than this, it is a repulsive force and prevents neutrons and protons being pushed together - 5what do alpha particles consist oftwo protons and two neutons
- 6explain beta radiationhappens when a neutron turns into a proton. a beta particle is emmited instantly with a anti-neutrino
- 7describe gamma radiationEM radiation emmited from unstable nucleus with to much energy.
no mass or charge. - 8wavelength equation
- 9what is a photonEM waves are emitted as short burst of waves,each leaving the source in different direction. each burst is know as a photon.
- 10Photon energy equation
- 11power of a laser beamE=nhf
n is the number of photons passing a fixed point each second. - 12what happens when antimatter and matter meet and where can this be usedthey destroy each other and radiation is released. can be used in (PET) scanners.
(positron emitting tomography (positrons annihilate electrons and release 2 gamma photons which are detected)) - 13what is annihilationoccurs when a particle and antiparticle meet and there mass is converted to radiation energy
- 14pair productiona photon creates a particle and corresponding antiparticle and vanishes in the process.
- 15weak nuclear forcechanges neutron to change into a proton in b- decay (opposite for b+)
Due to exchange of W-bosons - 16w- bosonshave non zero rest mass
very short range of no more than 0.001fm
can be positive or negative
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- A level Physics Flashcards on Matter and Radiation flash cards, created by MEGAN LITTLEWOOD on 19/03/2018.
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- MEGAN LITTLEWOOD
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- Created by Harvey M · Jan 27, 2016
- Copied by MEGAN LITTLEWOOD · Mar 19, 2018
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