# Shared Flashcard Set

## Details

test 2 review
88
Physics
11/29/2009

Term
 Velocity =
Definition
 v= d/t
Term
 Four systems of units for base quantities
Definition
 SI, MKS, CGS, and BRITISH
Term
 Average velocity =
Definition
 v avg= Vf + Vo / 2
Term
 Acceleration =
Definition
 a= Vf - Vo /t
Term
 If velocity is constant, acceleration is
Definition
 zero
Term
 acceleration is the rate of change of velocity with
Definition
 time.
Term
 the unit for velocity is
Definition
 m/s
Term
 a body will remain at rest or will continue to move with constant velocity in a strait line unless acted upon by an external force (what law of newtons law of motion?)
Definition
 1st law (inertia)
Term
 the force that acts upon an object is equal to the mass x acceleration produced
Definition
 2nd law of motion (force)
Term
 for every action, there is an equal and opposite reaction.
Definition
 3rd law of motion (action/reaction)
Term
 force F= ?
Definition
 mass x acceleration m x a
Term
 Units for Force
Definition
 Newtons
Term
 Weight is a force on a body caused by
Definition
 pull of gravity upon it.
Term
 weight is the product of
Definition
 mass and the acceleration of gravity on earth
Term
 Weight w = ?
Definition
 m x gmass of object x acceleration due to gravity
Term
 momentum is the product o
Definition
 mass and velocity
Term
 the total momentum before any interaction is equal to
Definition
 the total momentum after the interaction
Term
 momentum 'p' =
Definition
 mass x velocity
Term
 units for p momentum
Definition
 kg.m/s
Term
 work is the product of ...the unit is...
Definition
 force and distance(J) joule
Term
 Work W =
Definition
 f x d
Term
 power is the rate of
Definition
 doing work
Term
 the SI unit of power is the british unit of power is
Definition
 joule/second J/s or watt (W)horsepower hp
Term
 power p= ?
Definition
 work/time w/t
Term
 Energy is the ability to do
Definition
 work
Term
 the unit of energy is
Definition
 J joule
Term
 the energy of an object in motion
Definition
 kinetic energy
Term
 energy stored in position of configuration
Definition
 potential energy
Term
 KE =
Definition
 (1/2)mv^2
Term
 PE =
Definition
 mghmass, accel. from gravity, distance above earths surface
Term
 units of exposure in airtrad. and SI
Definition
Term
Definition
Term
 occupational/public dose (equiv. dose)trad. and SI
Definition
Term
Definition
Term
 pressure is measure by a
Definition
 barometer
Term
 pressure is quoted in units of (2) ?
Definition
 mmHg or cmHg
Term
 NTP
Definition
 normal temperature and pressure0 degrees celcius and 76 cmHg
Term
 3 things can vary in dealing with gas laws
Definition
 volume pressure and temp
Term
 chemicals that cannot be broken down into simpler chemical forms
Definition
 elements
Term
 the results of two or more elements linked together chemically
Definition
 compound
Term
 the smallest part of an element that can exist and still retain the chemical properties of that element
Definition
 atom
Term
 the smallest part of a compound that still retains the chemical properties of that compound. number of atoms linked together
Definition
 molecule
Term
 Rutherford described the nuclear model
Definition
 small dense positive center surrounded by negative electrons
Term
 bohr later improved the nuclear model. idea of
Definition
 electrons at different energy levels
Term
 at center of the atom is the nucleus. contains
Definition
 protons and nuetrons
Term
 the proton has ___ chargeneutron has ___ Charge
Definition
 proton +neutron is neutral no charge
Term
 electrons have ___ charge
Definition
 negative e-
Term
 what holds the electrons in their energy levels
Definition
 the electric force of attractions between the electrons and the positive nucleus
Term
 atomic number is the
Definition
 number of protons (also the number of electrons)
Term
 what determines the chemical properties?
Definition
 # of protons # of nuetrons does not
Term
 what would varying the number of neutrons do
Definition
 change the mass of the element
Term
 atomic number represented by
Definition
 z (subscript)
Term
 atomic mass represented by
Definition
 a (superscript)
Term
 the different electron shells represent different levels of
Definition
 potential energy
Term
 the further a shell is from the nucleus,
Definition
 the greater its PE
Term
 energy levels are represented by
Definition
 K, l , m , n , o ....
Term
 2n^2 gives you ...
Definition
 electron limit ( n is the shell number )
Term
 the strength of attachment of an electron to the nucleus is called
Definition
 the binding energy
Term
 the closer the electron is to the nucleus, the
Definition
 more tightly it is bound
Term
 the further away an electron is to the nucleus...
Definition
 higher the PE lower the binding energy
Term
 all matter is made up of
Definition
 elements and compounds
Term
 ______ is the smallest part of an element
Definition
 atom
Term
 _________ is the smallest part of a compound
Definition
Term
 the energy needed to release an electron is the same as
Definition
 the binding energy
Term
 when atoms have the same atomic number but different mass number
Definition
 isotope
Term
 results when changed number of neutrons
Definition
 isotope
Term
Definition
 emitting beta particles and gamma rays
Term
 when atoms of different elements have the same mass number, but still a different atomic number
Definition
 isobar
Term
Definition
 by HENRI BECQUEREL in 1896
Term
 a phenomenon in which radiation is given off by the nuclei of the element
Definition
Term
 nuclides eventually break up and emit particles and/or radiation energy from their nuclei = this is radioactivity and the unstable isotopes are called
Definition
Term
 _____________ have been usd as radiation therapy sources, but are also used in nuclear medicine
Definition
Term
Definition
 nuclear; it does not involve the orbital electrons; thus is not influenced by chemical changes nor by variations in env.
Term
 protons have like charges and would normally
Definition
 repel each other and break up the nucleus
Term
 some nuclide's, especially ones with high atomic numbers are ....no matter how many neutrons are present.
Definition
 unstable
Term
 uranium, with an atomic number of 92, has no...
Definition
 stable isotope
Term
 after disintegration, a new nuclide is formed which may or may not be stable... known as
Definition
 daughter products
Term
 examples of the many unstable isotopes that occur naturally are...
Definition
Term
 radioisotopes can be man-made in nuclear reactors and particle accelerators such as
Definition
 Sr-90 and Co-60
Term
 the common way in which isotopes can be produced is by altering the number of
Definition
 neutrons in the nucleus
Term
 isotopes can otherwise be produced by bombarding atoms with high speed...
Definition
 protons, deuterons, and alpha particles
Term
 what are the four modes of radioactive decay?
Definition
 alpha particle  beta particle electron capture gamma emission and internal conversion
Term
 the emission of an alpha particle is associated with the breakdown of ____________ such as uranium and radium
Definition
 heavy elements
Term
 the process of radioactive decay which is accompanied by the ejection of a
Definition
 positive or negative electron from thenucleus
Term
 ___________ and __________ do not exist in the nucleus, but are created at the instant of the decay process
Definition
 positrons and negatrons
Term
 phenomenon in which one of the orbital electrons is captured by the nucleus and so transforms a proton into a neutron
Definition
 electron capture
Term
 besides gamma emission, a nucleus can also lose energy by _______
Definition
 internal conversion ... process in which the excess energy is passed on to one of the orbiting electrons, which is then ejected.
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