University Physics Volume 3
17th Edition
ISBN: 9781938168185
Author: William Moebs, Jeff Sanny
Publisher: OpenStax
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Textbook Question
Chapter 9, Problem 79P
At what temperature, in terms of Tc, is the critical field of a superconductor one-half its value at T = 0 K?
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C01: Physical Quantities, Units and Measurements
4
A student wanted to measure the diameter of a cylindrical water bottle.
Which of the following gives the most accurate measurement?
A
B
CD
Take three measurements of the diameter using a rule before finding the
average.
Take three measurements of the diameter using a digital micrometer screw
gauge, resetting to zero before every measurement before finding the
average.
Take three measurements of the diameter using the digital calipers,
resetting to zero before every measurement before finding the average.
Take three measurements of the diameter using the digital calipers without
resetting to zero before every measurement before finding the average.
The resultant force FR acting on an object is given by, FR = ma, where m is the mass of
the object in kg and a is the acceleration of the object in m/s².
Which unit is equivalent to the unit for force?
A
B
с
D
kg ms²
kg m²s
kg m/s²
kg m²/s²
adt to…
C01: Physical Quantities, Units and Measurements
10 A student uses a rule to measure a thin piece of wire.
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15
(a) State two errors in the student's measurement of the length of wire.
[2]
The student records the length of the wire as 12.8 cm.
[E]
The student is asked to measure the thickness of the wire using a pencil and the
same rule. Suggest how this can be done as accurately as possible.
[4]
(b) The student finds out that the density of the wire is 2.7 g/cm³. Express 2.7 g/cm³ in
kg/m³.
[2]
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Chapter 9 Solutions
University Physics Volume 3
Ch. 9 - Check Your Understanding Why is the potential...Ch. 9 - Check Your Understanding What does the energy...Ch. 9 - Check Your Understanding If the dissociation...Ch. 9 - Check Your Understanding What happens to the...Ch. 9 - Check Your Understanding How does the magnitude of...Ch. 9 - Check Your Understanding What conditions are...Ch. 9 - What is the main difference between an ionic bond,...Ch. 9 - For the following cases, what type of bonding...Ch. 9 - Describe three steps to ionic bonding.Ch. 9 - What prevents a positive and negative ion from...
Ch. 9 - For the H2 molecule, why must the spins the...Ch. 9 - Does the absorption spectrum of the diatomic...Ch. 9 - Rank the energy spacing (E) of the following...Ch. 9 - Explain key features of a vibrational-rotation...Ch. 9 - Why is tbe equilibrium separation distance between...Ch. 9 - Describe the difference between a face-centered...Ch. 9 - In sodium chloride, how many Clatoms are “nearest...Ch. 9 - In cesium iodide, how many Clatoms are "nearest...Ch. 9 - The NaCl crystal structure is FCC. The equilibrium...Ch. 9 - Why does the Fermi energy (EF) increase with the...Ch. 9 - If the election number density (N/V) of a metal...Ch. 9 - Why does the horizontal Line in the graph in...Ch. 9 - Why does the graph in Figure 9.12 increase...Ch. 9 - Why are the sharp transitions at the Fermi energy...Ch. 9 - What are the two main approaches used to determine...Ch. 9 - Describe two features of energy levels for an...Ch. 9 - How does the number of energy levels in a band...Ch. 9 - Why are some materials very good conductors and...Ch. 9 - Why are some materials semiconductors?Ch. 9 - Why does the resistance of a semiconductor...Ch. 9 - What kind of semiconductor is produced if...Ch. 9 - What kind of semiconductor is produced if silicon...Ch. 9 - What is the Hall effect and what is it used for?Ch. 9 - For an n-type semiconductor, how do impurity atoms...Ch. 9 - For a p-type semiconductor, how do impurity atoms...Ch. 9 - When p- and n-type materials are joined, why is a...Ch. 9 - When p- and n-type materials are joined, why does...Ch. 9 - How do you know if a diode is in the forward...Ch. 9 - Why does the reverse bias configuration lead to a...Ch. 9 - What happens in the extreme case that where the n-...Ch. 9 - Explain how an audio amplifier works, using the...Ch. 9 - Describe two main features of a superconductor.Ch. 9 - How does BCS theory explain superconductivity?Ch. 9 - What is the Meissner effect?Ch. 9 - What impact does an increasing magnetic field have...Ch. 9 - The electron configuration of carbon is 1s22s22p2....Ch. 9 - Potassium chloride (KCl) is a molecule formed by...Ch. 9 - The electron affinity of Cl is 3.89 eV and the...Ch. 9 - The measured energy dissociated energy of KC1 is...Ch. 9 - In a physics lab, you measure the vibrational-...Ch. 9 - For the preceding problem, find the equilibrium...Ch. 9 - The separation between oxygen atoms in an O2...Ch. 9 - The characteristic energy of the N2 molecule is...Ch. 9 - The characteristic energy for KCl is 1.4105eV ....Ch. 9 - A diatomic F2 molecule is in the l = 1 state, (a)...Ch. 9 - In a physics lab, you measure the vibrational-...Ch. 9 - The Csl crystal structure is BCC. The equilibrium...Ch. 9 - The potential energy of a crystal is - 8.10 eV/ion...Ch. 9 - The measured density of a NaF crystal is 2.558...Ch. 9 - What value of the repulsion constant, n, gives the...Ch. 9 - Determine the dissociation energy of 12 moles of...Ch. 9 - The measured density of a KCl crystal is 1.984...Ch. 9 - What value of the repulsion constant, n, gives the...Ch. 9 - The measured density of a CsCl crystal is 3.988...Ch. 9 - What is the difference in energy between the...Ch. 9 - An electron is confined to a metal cube of I = 0.8...Ch. 9 - What value of energy corresponds to a density of...Ch. 9 - Compare the density of states at 2.5 eV and 0.25...Ch. 9 - Consider a cube of copper with edges 1.50 mm long....Ch. 9 - If there is one free electron per atom of copper,...Ch. 9 - Determine the Fermi energy and temperature for...Ch. 9 - For a one-dimensional crystal, write the lattice...Ch. 9 - What is the main difference between an insulator...Ch. 9 - What is the longest wavelength for a photon that...Ch. 9 - A valence electron in a crystal absorbs a photon...Ch. 9 - An experiment is performed to demonstrate the Hall...Ch. 9 - Suppose that the cross-sectional area of the strip...Ch. 9 - A current-carrying copper wire with cross-section...Ch. 9 - The Hall effect is demonstrated in the laboratory....Ch. 9 - Show that for V less than zero, InetI0.Ch. 9 - A p-n diode has a reverse saturation current...Ch. 9 - The collector current of a transistor is 3.4 A for...Ch. 9 - Applying the positive end of a battery to the...Ch. 9 - The base current of a transistor is 4.4 A, and its...Ch. 9 - At what temperature, in terms of Tc, is the...Ch. 9 - What is the critical magnetic field for lead at T...Ch. 9 - A Pb wire wound in a tight solenoid of diameter of...Ch. 9 - A tightly wound solenoid at 4.0 K is 50 cm long...Ch. 9 - Potassium fluoride (KF) is a molecule formed by...Ch. 9 - For the preceding problem, sketch the potential...Ch. 9 - The separation between hydrogen atoms in a H2...Ch. 9 - The characteristic energy of the Cl2 molecule is...Ch. 9 - Determine the lowest three rotational energy...Ch. 9 - A carbon atom can hybridize in the...Ch. 9 - List five main characteristics of ionic crystals...Ch. 9 - Why is bonding in favorable? Express your answer...Ch. 9 - Astronomers claim to find evidence of He2 from...Ch. 9 - Show that the moment of inertia of a diatomic...Ch. 9 - Show that the average energy of an electron in a...Ch. 9 - Measurements of a superconductor's critical...Ch. 9 - Estimate the fraction of Si atoms that must be...Ch. 9 - Transition in the rotation spectrum are observed...Ch. 9 - Determine the Fermi energies for (a) Mg, (b) Na,...Ch. 9 - Find the average energy of an electron in a Zn...Ch. 9 - What value of the repulsion constant, n, gives the...Ch. 9 - A physical model of a diamond suggests packing...Ch. 9 - For an electron in a three-dimensional metal, show...
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- tion v more m C01: Physical Quantities, Units and Measurements 8 The following shows a pencil. (a) pencil sharpened section Describe how you would use a piece of string and a rule to determine the circumference c of the unsharpened section of the pencil. [3] nd pupp e e E (b) The student's value for the circumference c is 2.5 cm. Suggest a source of error in determining the circumference of the pencil. [1] ntit ble Ec et (c) Show the volume V of the unsharpened section of the pencil is V = c²x [3] ΑΠ 55 sn ar 2 72 C: or n/ el D a 7 9 (d) Express the volume VE of the sharpened section of the pencil in terms of c and y. pilasi to leeries to rignal on [3] State any assumptions made. lau besser A student is required to measure the thickness of a ream of 500 sheets of A4 size paper. He is supplied with a plastic rule, a digital micrometer screw gauge and a pair of digital calipers. (a) Choose the instrument that is most suitable to measure the thickness of the ream of paper. Give two…arrow_forward5 C01: Physical Quantities, Units and Measurements 4 Complete the table by stating a suitable instrument for obtaining each of the following lengths to be measured. (6) Length to be measured (a) 12.0 cm (b) 8.880 mm (c) 4.440 cm (d) (e) internal diameter of a test tubes bas thickness of a wire (f) height of a bedroom Suitable Instrument 5 Fill in the blanks by making estimates of each of the following quantities. [5] (a) The thickness of a sheet of paper = mm (b) The time for one heartbeat = (c) The mass of 500 cm3 of water = S g (d) The height of a 4-year-old = 3 (e) The average human reaction time S hoda 6 A student has a stack of 20 identical coins. The following diagram shows the student measuring the height of the stack using a rule.uis en cm 15. 10 7 eye (6) ream of (3) emuntani na mBM (0) 5. stack of 20 coins 0 (b) With his eye at the position shown, the student's measurement of the height of the stack is 6.8 cm. (a) Suggest two reasons why the student's measurement is…arrow_forwardoutside the theory of evolution, the spontaneous emergence of complexity and information from randomness is not recognized in nature. true or falsearrow_forward
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