7 Written Questions

1. When masses and relative amounts of isotopes have been found, the average _______ can be calculated.
2. A(n) _______ is any of a class of light, elementary subatomic particles.
3. The phenomenon of the spontaneous production of rays by unstable atomic nuclei is called _____.
4. Max Planck proposed that energy is radiated continuously in little packets called ________.
5. For every particle, a mirror-image particle, called a(n) _________.
6. In a cathode-ray tube, the positive terminal is called a(n) _______.
7. Another name for helium nucleus is a(n) __________.

6 Multiple Choice Questions

1. A(n) ________ is an atom that has the same number of protons as another atom, but a different number of neutrons.
   1. Gluon
   2. Lepton
   3. Anode
   4. Isotope
2. A theoretical particle exchanged by quarks is called a(n) _______.
   1. Gluon
   2. Meson
   3. Hertz
   4. Lepton
3. A(n) _______ is an essentially massless, neutral lepton,
   1. Spectrum
   2. Neutrino
   3. Quark
   4. Lepton
4. Frequency is measured in a unit called a(n) _________, which is equal to one cycle per second.
   1. Hertz
   2. Lepton
   3. Quark
   4. Meson
5. The _______ of a substance is the unique set of wavelengths absorbed or emitted by that substance.
   1. Lepton
   2. Spectrum
   3. Spectroscopy
   4. Neutrino
6. A very-high-energy X ray given off by a nucleus is called a(n) ________.
   1. Cathode ray
   2. Gamma ray
   3. Quanta
   4. Quark

6 True/False Question

1. Spectroscopy → The methods of studying substances that are exposed to some sort of continuous exciting energy are referred to as _______.
   

   True        False

2. Cathode ray → A stream of electrons traveling toward the anode is a(n) _______.
   

   True        False

3. Mass number → The ______ refers to the total number of nucleons is an atom.
   

   True        False

4. Law of definite proportions → The ______ states that specific substances always contain elements in the same ratio by mass.
   

   True        False

5. Meson → A(n) _______ is a hadron composed of a quark and an antiquark.
   

   True        False

6. Quark → A(n) _______ is a theoretical particle that is believed to be a constituent of a hadron.
   

   True        False