Physics Principles and Problems 2009

Section 30.1 : The Nucleus

Self-Check Quizzes

1
What information do atomic number and atomic mass number give about an atom?
A)Atomic number is the number of protons and neutrons and the atomic mass number is the number of protons that make up a particular atom.
B)Atomic number is the number of neutrons and the atomic mass number is the number of protons and neutrons that make up a particular atom.
C)Atomic number is the number of protons and the atomic mass number is the number of protons and neutrons that make up a particular atom.
D)Atomic number is the number of protons and the atomic mass number is the energy equivalent of the protons and neutrons that make up a particular atom.
2
A nucleus is made of protons and neutrons, each with a mass of 1 u. Why are the masses of many elements as given by the periodic table not whole numbers?
A)The atomic mass is determined from an average sample of the element, which includes naturally occurring isotopes.
B)The mass of electrons is accounted for.
C)The mass given often changes as more accurate measurements are made.
D)The nuclides of elements can change over time.
3
Why don't the positive charges of the protons in a nucleus repel each other and cause the nucleons to separate?
A)The neutrons in the nucleus hold it together.
B)Scientists are currently researching this question.
C)The motion of the electrons holds the nucleons together.
D)The strong nuclear force holds them together.
4
How is the mass defect of a nucleus calculated?
A)It is calculated using the equation e = mc2.
B)It is calculated as the actual mass of the nucleus minus the sum of the masses of the individual nucleons.
C)It is calculated by taking the average of the masses of all the known isotopes.
D)The nucleus is weighed.
5
What equation is used to obtain the energy equivalent of 1 u of mass?
A)E = mc2.
B)The equation for the speed of light is needed.
C)Nuclear charge = Ze.
D)The equation for average binding energy, which depends on mass number, is used.
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