Plot of the intensity of light emitted from a hot body over a range of frequencies.
What is emission spectrum?
100
The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
What is a nucleus?
100
A device that produces powerful, coherent, directional, monochromatic light that can be used to excite other atoms.
What is a laser?
100
The number of protons in an atom's nucleus.
What is the atomic number?
100
Materials that undergo radioactive decay and emit penetrating rays.
What is radioactive?
200
Discrete, quantized bundle of radiation that travels at the speed of light.
What is a photon?
200
Massive, positively charged particles that move at high speeds.
What are alpha particles?
200
A model that predicts only the probability that on electron is in a particular region.
What is a quantum model?
200
The energy equivalent of the mass defect, is always negative.
What is binding energy?
200
The time required for half the atoms in a given quantity of a radioactive isotope to decay.
What is a half-life?
300
Shift in the energy of scattered photons.
What is the Compton effect?
300
The set of wavelengths absorbed by a gas.
What is the absorption spectrum?
300
The region in which there is a high probability of finding an electron.
What is an electron cloud?
300
A unit of mass where, u, is equal to 1.66 x 10^-27 kg
What is the atomic mass unit?
300
The process in which a nucleus is divided into two or more fragments, and neutrons and energy are released.
What is fission?
400
6.63 x 10^-34 Jxs
What is planck's constant?
400
The integer, n, that appears in the equation:
E=-13.6eV x 1/n^2
What is The principal quantum number?
400
Light with synchronized wave fronts that illuminates objects with an even, white light.
What is incoherent light?
400
Each of the differing forms of the same atom that have different masses but have the same chemical properties.
What is an isotope?
400
The process in which nuclei with small masses combine to form a nucleus with a larger mass and energy is released.
What is fusion?
500
Impossible to measure precisely both the position and momentum of a particle at the same time.
What is the Heisenberg Uncertainty Principle?
500
Theory used to calculate the wavelengths of light emitted by a hydrogen atom.
What is Bohr's model?
500
The process that occurs when an excited atom is struck by a photon having energy equal to the energy difference between the excited state and the ground state- the atom drops to the ground state and emits a photon with energy difference between the two states.
What is stimulated emission?
500
An attractive force that binds the nucleus together, is of the same strength between protons and protons, protons and neutrons and neutrons, and neutrons and protons.
What is the strong nuclear force?
500
Occurs when the number of neutrons or protons in a nucleus changes: can be produced by bombardment of nuclei, protons, neutrons, alpha particles or electrons.