Flashcards
Particle and Radiation
Flashcards do conjunto (15)
- 1Proton-Relative charge of 1+
-SI unit for charge +1.60 *-10^19
-Relative atomic mass of 1
-SI unit for mass 1.67*10^-27 - 2Electrons-Relative charge of -1
-SI unit charge -1.60*10^-19
-Atomic mass of 1/2000
-SI unit mass 9.11*10^-31 - 3Neutrons-Relative charge of 0
-Relative atomic mass of 1
-No SI unit, as if it has no charge (0 cannot be divided) - 4Specific ChargeSpecific Charge (C/kg)= charge (C)/ mass (kg)
- 5Nuclide-A specific nucleus, containing a certain number of protons and neutrons
- 6Nuclides of the same element will have...-The same proton number
-Different nucleon (protons and neutron) numbers. (different number of neutrons)
-The same number of electrons - 7IsotopeForm of an element that have the same number of protons, but a different number of neutrons.
- 8Stable nucleus-Positively charged
-Has strong nuclear force, else the nucleus would break apart due to electrostatic repulsion between protons. - 9Strong Nuclear force is..A force that keeps the nucleus stable by counteracting the electrostatic force of repulsion between protons.
- 10How does the force react at a range of 3fm (3*10^-15 m)?Negligible
-If the protons are separated by more than 3fm (10^-15), the nuclear force is too weak to overcome electrostatic repulsion. - 11How does the force react at a range of 0.5fm (5*10^-14 m)?-Nuclei do not collapse into a point.
-Nuclear forces must be repulsive at small distances (0.5 fm) - 12How does the force react at a range of 0.5-3fm?-The nuclear force is attractive
- 13How will nuclei, with too many NUCLEONS decay? (occurs in very large nuclei)Alpha decay
-An emission of a helium nucleus, formed by 2 protons and 2 neutrons.
-Proton number decreases by 2, nucleon number decreases by 4. - 14How do nuclei with too many NEUTRONS decay?Beta decay
-A neutron decays into a proton, releasing an electron and an neutrino.
-Proton number increases by 1, nucleon number stays the same. - 15How was the existence of the neutrino hypothesised?-The energy of all the particles after beta decay was lower, than before.
-A particle with 0 charge and negligible charge must carry away this excess energy.
Informações
- Descrição
- -Atomic model -Specific charge, Proton, Neutrons numbers -Isotopes -Stable and Unstable nuclei -Particles, antiparticles and photons -Particle interactions -Classification of particles -Quarks, and antiquarks -Conservation Laws -Photoelectric effect -Collisions of electrons with atoms -Energy Levels and photon emission -Wave-particle duality -Absorption and emission
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- pauline !
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