# Shared Flashcard Set

## Details

Physics Ch. 9 - Atomic and Nuclear Phenomena
MCAT
13
Physics
06/01/2016

Term
 What is the equation for determining the energy of a photon?
Definition
 E = hf E is energy J (kg·m2·s-2) h is Planck's constant 6.626 x 10-34 J·s f is frequency in Hz (s-1)
Term
 photoelectric effect
Definition
 the ejection of an electron from the surface of a metal in response to light
Term
 threshold frequency
Definition
 the minimum light frequency necessary to eject an electron from a given metal
Term
 Bohr model of the atom
Definition
 states that electron energy levels are stable and discrete, corresponding to specific orbits; electrons can jump up or down between these energy levels by absorbing or emitting the exact amount of energy between the levels
Term
 mass defect
Definition
 the difference between the mass of the unbonded nucleons and the mass of the bonded nucleons within the nucleus; the amount of mass converted to energy during nuclear fusion
Term
 equation that relates energy and mass
Definition
 E = mc2 E is energy in J (kg·m2·s-2) m is mass in kg c is speed of light in m/s
Term
 What are the kinds of radioactive decay?
Definition
 Alpha decay Beta decay (positive and negative) Gamma decay Electron capture
Term
 Alpha decay
Definition
 the emission of an alpha particle which is a helium nucleus; interact highly with matter [image]
Term
 Beta decay
Definition
 Can be subdivided into beta positive and beta negative decay Beta positive decay - also called positron emission, is the decay of a proton into a neutron, with emission of a positron and a neutrino Beta negative decay - the decay of a neutron into a proton, with emission of an electron and an antineutrino [image] [image]
Term
 Gamma decay
Definition
 the emission of a gamma ray, which converts a high energy nucleus into a more stable nucleus [image]
Term
 electron capture
Definition
 the absorption of an electron from the inner shell that combines with a proton in the nucleus to form a neutron [image]
Term
 exponential decay
Definition
 the rate at which the radionuclei decay is proportionate to how many are left (1st order reaction)   n = n0e-λt n is the number of nuclei remaining n0 is the original number of nuclei λ is the decay constant t is time   The n's are analogous to concentration in the equation of a first order reaction (GenChem). λ is analogous to the rate constant.
Term
 How is the decay constant related to the half life?
Definition
 λ = 0.693/T1/2
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