Exam 5: Matter Behaves Like Waves Quantum Physics

Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen , -The spacing between the slits increases.

(Multiple Choice)

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Question 181

Consider the experimental evidence we have discussed in the past few chapters. Classify the following experimental results according to the following scheme: For the quantons in question, the results: -When light shines on a surface, at least a few electrons seem to get ejected virtually as soon as the surface is illuminated, even if the light is extremely dim.

(Short Answer)

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Question 182

Suppose that at time $t=0$ an electron in a magnetic field in the $+z$ direction has state $|\psi(0)\rangle=|+x\rangle$ . Let $\omega=\left[E_{+}-E_{-}\right] / \hbar$ . -(a) The expectation value $\left\langle s_{z}\right\rangle$ as a function of time in this case is which of the below?

(Multiple Choice)

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Question 183

A nucleus with binding energy $E_{b 1}$ fuses with one having binding energy $E_{b 2}$ . The resulting nucleus has binding energy $E_{b 3}$ . What is the total energy released in this fusion reaction?

(Multiple Choice)

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Question 184

The moderator in a fission reactor

(Multiple Choice)

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Question 185

In a spectrum chart (like the one shown in figure Q11.2), the emission lines produced by a quantum harmonic oscillator

(Multiple Choice)

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Question 186

The main reason that gamma photons are more penetrating than either alpha particles or electrons is that

(Multiple Choice)

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Question 187

The main reason that massive nuclei don't simply shed protons to relieve the instability caused by too much electrostatic repulsion is that

(Multiple Choice)

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Question 188

Suppose we add a certain amount of energy to a simple quantum harmonic oscillator, increasing its energy from $E_{n}$ to $E_{n+1}$ . Adding the same amount of energy again will increase its energy to $E_{n+2}$ .

(True/False)

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Question 189

In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why?

(Multiple Choice)

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Question 190

A charged particle moving in the magnetic field created by an external magnet experiences a force that is perpendicular to both the particle's velocity $\vec{v}$ and the direction of the magnetic field $\vec{B}$ in the sense indicated by your right thumb if your right index finger points in the direction of $\vec{v}$ and your adjacent finger points in the direction of $\vec{B}$ . (The magnetic field $\vec{B}$ , in turn, points away from the external magnet's north pole and toward its south pole.) A certain radioactive substance emits quantons that, when placed in a magnetic field directed away from the observer, bend to the right side of their direction of travel. These nuclei are decaying via which kind of process?

(Multiple Choice)

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Question 191

For experiments involving the setup shown in figure $\mathrm{Q} 4.1 \mathrm{~b}$ , which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? $For experiments involving the setup shown in figure \mathrm{Q} 4.1 \mathrm{~b} , which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? (b) Metallic plate (cathode)$ (b) Metallic plate (cathode)

(Multiple Choice)

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Question 192

A sinusoidal standing sound wave inside a tube that is open at both ends must fit between the tube's ends

(Multiple Choice)

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Question 193

Consider an experiment where we send monochromatic light to a distant screen through a single narrow slit. The distance between adjacent dark fringes in the diffraction pattern displayed on the screen -The intensity of the light increases.

(Multiple Choice)

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Question 194

Weak-interaction processes conserve both electric charge and a quantity called "lepton number." Electrons have lepton number $=+1$ , positrons have lepton number -1 , and nucleons have lepton number $=0$ . Study the weak interactions in this chapter. -(a) What can you infer about the lepton number of the neutrino?

(Multiple Choice)

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Question 195

We can consider the state $|+x\rangle$ to be a superposition of $|+z\rangle$ and $|-z\rangle$ states.

(True/False)

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Question 196

Imagine that an electron with an initial spin state $|\psi\rangle=\left[\begin{array}{c}\frac{3}{5} \\-\frac{4}{5}\end{array}\right]$ Goes into an SGx device and comes out the - channel of that device. The electron's spin state is now

(Multiple Choice)

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Question 197

A positron will travel roughly as far through a given material as an electron with the same energy.

(True/False)

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Question 198

Must all physically reasonable wave functions be wavelike in classically allowed regions and exponential-like in forbidden regions (A), or does this apply only to solutions to the Schrödinger equation (B)?

(Multiple Choice)

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Question 199

${ }_{92}^{235} \mathrm{U}$ (uranium) can decay to ${ }_{82}^{206} \mathrm{~Pb}$ (lead) through an appropriate sequence of alpha and beta decay processes.

(True/False)

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Question 200

Showing 181 - 200 of 210

Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen , -The spacing between the slits increases.

Suppose that at time $t=0$ an electron in a magnetic field in the $+z$ direction has state $|\psi(0)\rangle=|+x\rangle$ . Let $\omega=\left[E_{+}-E_{-}\right] / \hbar$ . -(a) The expectation value $\left\langle s_{z}\right\rangle$ as a function of time in this case is which of the below?

A nucleus with binding energy $E_{b 1}$ fuses with one having binding energy $E_{b 2}$ . The resulting nucleus has binding energy $E_{b 3}$ . What is the total energy released in this fusion reaction?

The moderator in a fission reactor

In a spectrum chart (like the one shown in figure Q11.2), the emission lines produced by a quantum harmonic oscillator

The main reason that gamma photons are more penetrating than either alpha particles or electrons is that

The main reason that massive nuclei don't simply shed protons to relieve the instability caused by too much electrostatic repulsion is that

Suppose we add a certain amount of energy to a simple quantum harmonic oscillator, increasing its energy from $E_{n}$ to $E_{n+1}$ . Adding the same amount of energy again will increase its energy to $E_{n+2}$ .

In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why?

A sinusoidal standing sound wave inside a tube that is open at both ends must fit between the tube's ends

Consider an experiment where we send monochromatic light to a distant screen through a single narrow slit. The distance between adjacent dark fringes in the diffraction pattern displayed on the screen -The intensity of the light increases.

We can consider the state $|+x\rangle$ to be a superposition of $|+z\rangle$ and $|-z\rangle$ states.

Imagine that an electron with an initial spin state $|\psi\rangle=\left[\begin{array}{c}\frac{3}{5} \\-\frac{4}{5}\end{array}\right]$ Goes into an SGx device and comes out the - channel of that device. The electron's spin state is now

A positron will travel roughly as far through a given material as an electron with the same energy.

Must all physically reasonable wave functions be wavelike in classically allowed regions and exponential-like in forbidden regions (A), or does this apply only to solutions to the Schrödinger equation (B)?

${ }_{92}^{235} \mathrm{U}$ (uranium) can decay to ${ }_{82}^{206} \mathrm{~Pb}$ (lead) through an appropriate sequence of alpha and beta decay processes.

Conservation Laws Constrain Interactions

The Laws of Physics Are Universal Newtonian Mechanics

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Some Processes Are Irreversible Thermal Physics

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Exam 5: Matter Behaves Like Waves Quantum Physics

Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen , -The spacing between the slits increases.

A nucleus with binding energy Eb1E_{b 1}Eb1​ fuses with one having binding energy Eb2E_{b 2}Eb2​ . The resulting nucleus has binding energy Eb3E_{b 3}Eb3​ . What is the total energy released in this fusion reaction?

The moderator in a fission reactor

In a spectrum chart (like the one shown in figure Q11.2), the emission lines produced by a quantum harmonic oscillator

The main reason that gamma photons are more penetrating than either alpha particles or electrons is that

The main reason that massive nuclei don't simply shed protons to relieve the instability caused by too much electrostatic repulsion is that

Suppose we add a certain amount of energy to a simple quantum harmonic oscillator, increasing its energy from EnE_{n}En​ to En+1E_{n+1}En+1​ . Adding the same amount of energy again will increase its energy to En+2E_{n+2}En+2​ .

In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why?

For experiments involving the setup shown in figure Q4.1 b\mathrm{Q} 4.1 \mathrm{~b}Q4.1 b , which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? (b) Metallic plate (cathode)

A sinusoidal standing sound wave inside a tube that is open at both ends must fit between the tube's ends

Consider an experiment where we send monochromatic light to a distant screen through a single narrow slit. The distance between adjacent dark fringes in the diffraction pattern displayed on the screen -The intensity of the light increases.

We can consider the state ∣+x⟩|+x\rangle∣+x⟩ to be a superposition of ∣+z⟩|+z\rangle∣+z⟩ and ∣−z⟩|-z\rangle∣−z⟩ states.

Imagine that an electron with an initial spin state ∣ψ⟩=[35−45]|\psi\rangle=\left[\begin{array}{c}\frac{3}{5} \\-\frac{4}{5}\end{array}\right]∣ψ⟩=[53​−54​​] Goes into an SGx device and comes out the - channel of that device. The electron's spin state is now

A positron will travel roughly as far through a given material as an electron with the same energy.

Must all physically reasonable wave functions be wavelike in classically allowed regions and exponential-like in forbidden regions (A), or does this apply only to solutions to the Schrödinger equation (B)?

92235U{ }_{92}^{235} \mathrm{U}92235​U (uranium) can decay to 82206 Pb{ }_{82}^{206} \mathrm{~Pb}82206​ Pb (lead) through an appropriate sequence of alpha and beta decay processes.

Conservation Laws Constrain Interactions

The Laws of Physics Are Universal Newtonian Mechanics

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Some Processes Are Irreversible Thermal Physics

Filters

A nucleus with binding energy $E_{b 1}$ fuses with one having binding energy $E_{b 2}$ . The resulting nucleus has binding energy $E_{b 3}$ . What is the total energy released in this fusion reaction?

Suppose we add a certain amount of energy to a simple quantum harmonic oscillator, increasing its energy from $E_{n}$ to $E_{n+1}$ . Adding the same amount of energy again will increase its energy to $E_{n+2}$ .

We can consider the state $|+x\rangle$ to be a superposition of $|+z\rangle$ and $|-z\rangle$ states.

Imagine that an electron with an initial spin state $|\psi\rangle=\left[\begin{array}{c}\frac{3}{5} \\-\frac{4}{5}\end{array}\right]$ Goes into an SGx device and comes out the - channel of that device. The electron's spin state is now

${ }_{92}^{235} \mathrm{U}$ (uranium) can decay to ${ }_{82}^{206} \mathrm{~Pb}$ (lead) through an appropriate sequence of alpha and beta decay processes.