physics part I review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is Thomas Atom known for? | Cathode ray tubes (atom looks like plum pudding)
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| What did Ernest Rutherford do? | 1911 introduced nuclear model
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| What is Bohr Atom known for? | Minature solar system model
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| What is a quark? | photon
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| Name two new theories? | string and quantum chromodynamics
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| What is an isotope? | atom with the same # of protons but a different # of neutrons
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| What is energy? | ability to do work
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| what is mechanics? | deals with the motion of objects
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| Is weight dependent on gravity? | Yes
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| What is weight? | the force an object exerts under gravity
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| What is mass? | amount of matter contained in an object
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| What is a molecule? | smallest particle of a compound
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| What is a compound? | two or more elements joined together
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| What is an atom? | Smallest particle of an element
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| How many elements are there? | 100 approx.
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| What is matter? | substances making up all physical objects having mass, weight and that can change shape
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| The atomic # is equal to? | # of protons
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| What is the atomic mass equal to? | protons + neutrons
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| Who invented the periodic table? | Dmitri Mendeleev
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| What makes up an atom? | proton, neutron, electron
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| In 1911, Rutherford showed that the atom was composed of what? | nucleus
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| If an electron is gained or lost from an atom, what is it called??? | ionized
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| What is radioactivity? | some atoms exist in abnormally excited states characterized by an unstable nucleus. To become stable nucleus transforms into another atom
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| How is an ion pair formed? | the x-ray photon transfers its energy to orbital electron and ejects that electron from the atom.
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| What is centripetal force? | electrons revolve around nucleus in fixed orbits/shells
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| What is centrifugal force? | in the normal arom this force balances the centripetal force (autoclave)
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| What is the Law of conservation of energy? | sum total of all matter and energy is a constant
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| Can either matter or energy be destroyed/created? | No
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| Are gamma rays natural? | Yes
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| Is potential energy stored? | Yes
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| With kinetic energy random motion of molecules cause? | heat
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| A heat unit if equal to? | Calorie
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| What is work? | Result of force acting on an object
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| What is Newton's 1st Law? | A body will remain at rest unless acted on by an external force?
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| What is Newton's 2nd Law? | The force applied to move an object is equal to the mass of the object x acceleration
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| What is Newton's 3rd Law? | For every action there is an equal and opposite reaction
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| What is motion? | Velocity or acceleration
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| What is velocity? | Speed, the rate of change of position over time, i.e. 150mph
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| What is acceleration? | rate of change of velocity over timei.e. 0 to 60 in 30 seconds
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| What is power? | rate of doing work
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| What is a bindle of energy? | Photon
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| Who first came up with the atom? | greeks
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| What is Dalton Atom known for? | 1st to break down concept of the element. English school teacher
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| What did Dmitri Mendeleev do? | Periodic table
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| The periodic table is based upon what? | the number of protons in each element
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| Electromagnetic energy travels? | at the speed of light
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| Are x-rays monoenergetic? | No, they are polyenergetic
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| Are x-rays homogenous? | No, they are heterogeneous
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| Are x-rays electrically charged? | No, they are neutral
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| Can we focus x-rays with a lens? | No
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| An electron has what charge? | Negative
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| What are two different types of mechanical energy? | potential and kinetic
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| Can we convert mechanical energy into thermal energy? | Yes
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| Can we convert electrical energy into chemical energy? | Yes
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| Are x-rays able to travel in a vacuum? | Yes
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| What does the glass envelope of the tube do? | It acts as a vacuum
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| The sum of protons and neutrons in the nucleus is called what? | Atomic mass
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| What is the quantum numnber? | the number of cells
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| In the excitation process, the electrons in an atom are moved to what energy state? | higher energy
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| Do isotopes have the same or different mass number? | Different
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| Do isotopes have the same or different atomic number? | Same
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