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كويز تفاعلي: 18 Questions: Atomic and Nuclear Physics Review
This document contains a series of multiple-choice questions focusing on atomic structure, Bohr's model, and nuclear physics concepts. Topics covered include isotopes, nuclear notation, nucleon properties, strong nuclear force, mass defect, and binding energy calculations.
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Question 1
DB question no.: 1
Points: 1
Starting from Bohr's quantized angular momentum ($mvr = n\frac{h}{2\pi}$), which step leads directly to the stable orbit circumference equation?
Explanation
Rearranging the angular momentum equation $mvr = n\frac{h}{2\pi}$ gives $2\pi r = n\frac{h}{mv}$, which relates the circumference to the de Broglie wavelength.
Question 2
DB question no.: 2
Points: 1
Protons and neutrons are collectively referred to by which of the following terms?
Explanation
Nucleons is the collective term for the particles found in the atomic nucleus, namely protons and neutrons.
Question 3
DB question no.: 3
Points: 1
The total number of nucleons (protons plus neutrons) in an atom is defined as the:
Explanation
The mass number (A) represents the sum of protons and neutrons in the nucleus.
Question 4
DB question no.: 4
Points: 1
In the standard nuclear notation {}_{Z}^{A}X, what does the subscript Z represent?
Explanation
In nuclear notation, the subscript Z is the atomic number, which identifies the number of protons in the nucleus.
Question 5
DB question no.: 5
Points: 1
An atom of Uranium-235 is represented as {}_{92}^{235}U. How many neutrons are in the nucleus of this isotope?
Explanation
The number of neutrons is found by subtracting the atomic number from the mass number: 235 - 92 = 143.
Question 6
DB question no.: 6
Points: 1
How many neutrons are present in the nucleus of the mercury isotope {}_{80}^{200}Hg?
Explanation
Neutrons = Mass Number (A) - Atomic Number (Z) = 200 - 80 = 120.
Question 7
DB question no.: 7
Points: 1
An isotope of oxygen has a mass number of 15. Given that oxygen's atomic number (Z) is 8, how many neutrons does this specific isotope have?
Explanation
The number of neutrons is A - Z = 15 - 8 = 7.
Question 8
DB question no.: 8
Points: 1
Which of the following symbols correctly represents an isotope of hydrogen that contains two neutrons in its nucleus?
Explanation
Hydrogen has 1 proton. If it has 2 neutrons, the mass number A = 1 + 2 = 3. The symbol is {}_{1}^{3}H (tritium).
Question 9
DB question no.: 9
Points: 1
Look at Figure 3. What is the main difference between the three isotopes of hydrogen shown?
Explanation
Isotopes are atoms of the same element (same number of protons) but with different numbers of neutrons.
Question 10
DB question no.: 10
Points: 1
The attractive force that acts between nucleons (protons and neutrons) and holds the nucleus together is known as the:
Explanation
The strong nuclear force is the powerful attractive force that binds protons and neutrons together in the nucleus.
Question 11
DB question no.: 11
Points: 1
Look at Figure. According to the diagram and the text, between which pairs of nucleons does the strong nuclear force act?
Explanation
The strong nuclear force acts between all pairs of nucleons (protons and neutrons) regardless of their charge.
Question 12
DB question no.: 12
Points: 1
How does the strength and range of the strong nuclear force compare to the electromagnetic force?
Explanation
The strong force is much stronger than the electromagnetic force to overcome proton repulsion, but its range is limited to the dimensions of the nucleus.
Question 13
DB question no.: 13
Points: 1
What is "mass defect" in nuclear physics?
Explanation
Mass defect is the missing mass that is converted into energy to bind the nucleus together.
Question 14
DB question no.: 14
Points: 1
Why don't the protons in a nucleus fly apart due to their mutual electromagnetic repulsion?
Explanation
The strong nuclear force acts as a 'glue' that is significantly stronger than the electrostatic repulsion between positively charged protons.
Question 15
DB question no.: 15
Points: 1
The mass of the tritium isotope ({}_{1}^{3}H) is 3.016049 u. Given the mass of a hydrogen atom (1p + 1e) is 1.007825 u and the mass of a neutron is 1.008665 u, what is the mass defect ($\Delta m$) of tritium?
Explanation
Mass defect = [Mass of 1 H atom + 2(Mass of neutron)] - Mass of Tritium = [1.007825 + 2(1.008665)] - 3.016049 = 3.025155 - 3.016049 = 0.009106 u.
Question 16
DB question no.: 16
Points: 1
Based on the mass defect of tritium (0.009106 u), what is its binding energy in MeV? (Use 1u = 931.49 MeV)
Explanation
Binding energy = mass defect × energy per u = $0.009106 \times 931.49 \approx 8.48$ MeV.
Question 17
DB question no.: 17
Points: 1
The carbon isotope {}_{6}^{12}C has a measured mass of exactly 12.000000 u. What is its mass defect?
Explanation
For C-12 (6p, 6n): $\Delta m = [6(1.007825) + 6(1.008665)] - 12.000000 = 12.098940 - 12.000000 = 0.098940$ u.
Question 18
DB question no.: 18
Points: 1
A nitrogen isotope ({}_{7}^{15}N) has a mass of 15.010109 u. What is its binding energy?
Explanation
For N-15 (7p, 8n): $\Delta m = [7(1.007825) + 8(1.008665)] - 15.010109 = 15.124095 - 15.010109 = 0.113986$ u. Energy = $0.113986 \times 931.49 \approx 106.18$ MeV.
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