Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term
9th Edition
ISBN: 9781305932302
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Question
Chapter 41, Problem 3OQ
To determine
Whether the statements are true or false for an electron.
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Consider a freely moving quantum particle with mass m and speed u. Its energy is E = K = 1/2mu2. (a) Determine the phase speed of the quantum wave representing the particle and (b) show that it is different from the speed at which the particle transports mass and energy.
The wave function of a particle at t = 0 is given as:
ψ(x, t) = C exp[ -|x|/x0]
where C and x0 are constants.
(a) What is the relation between C and x0?(b) Calculate the expectation value of position x of the particle.(c) Suggest a region in x in which the probability of finding the particle is 0.5.
For a quantum particle of mass m in the ground state of a square well with length L and infinitely high walls, the uncertainty in position is Δx ≈ L. (a) Use the uncertainty principle to estimate the uncertainty in its momentum.(b) Because the particle stays inside the box, its average momentum must be zero. Its average squared momentum is then ⟨p2⟩ ≈ (Δp)2. Estimate the energy of the particle. (c) State how the result of part (b) compares with the actual ground-state energy.
Chapter 41 Solutions
Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term
Ch. 41.1 - Prob. 41.1QQCh. 41.2 - Prob. 41.2QQCh. 41.2 - Prob. 41.3QQCh. 41.5 - Prob. 41.4QQCh. 41 - Prob. 1OQCh. 41 - Prob. 2OQCh. 41 - Prob. 3OQCh. 41 - Prob. 4OQCh. 41 - Prob. 5OQCh. 41 - Prob. 6OQ
Ch. 41 - Prob. 7OQCh. 41 - Prob. 8OQCh. 41 - Prob. 9OQCh. 41 - Prob. 10OQCh. 41 - Prob. 1CQCh. 41 - Prob. 2CQCh. 41 - Prob. 3CQCh. 41 - Prob. 4CQCh. 41 - Prob. 5CQCh. 41 - Prob. 6CQCh. 41 - Prob. 7CQCh. 41 - Prob. 8CQCh. 41 - Prob. 1PCh. 41 - Prob. 2PCh. 41 - Prob. 3PCh. 41 - Prob. 4PCh. 41 - Prob. 5PCh. 41 - Prob. 6PCh. 41 - Prob. 7PCh. 41 - Prob. 8PCh. 41 - Prob. 9PCh. 41 - Prob. 10PCh. 41 - Prob. 11PCh. 41 - Prob. 12PCh. 41 - Prob. 13PCh. 41 - Prob. 15PCh. 41 - Prob. 16PCh. 41 - Prob. 17PCh. 41 - Prob. 18PCh. 41 - Prob. 19PCh. 41 - Prob. 20PCh. 41 - Prob. 21PCh. 41 - Prob. 22PCh. 41 - Prob. 23PCh. 41 - Prob. 24PCh. 41 - Prob. 25PCh. 41 - Prob. 26PCh. 41 - Prob. 27PCh. 41 - Prob. 28PCh. 41 - Prob. 29PCh. 41 - Prob. 30PCh. 41 - Prob. 31PCh. 41 - Prob. 32PCh. 41 - Prob. 33PCh. 41 - Prob. 34PCh. 41 - Prob. 36PCh. 41 - Prob. 37PCh. 41 - Prob. 38PCh. 41 - Prob. 39PCh. 41 - Two particles with masses m1 and m2 are joined by...Ch. 41 - Prob. 41PCh. 41 - Prob. 42PCh. 41 - Prob. 43APCh. 41 - Prob. 44APCh. 41 - Prob. 45APCh. 41 - Prob. 46APCh. 41 - Prob. 47APCh. 41 - Prob. 48APCh. 41 - Prob. 49APCh. 41 - Prob. 50APCh. 41 - Prob. 51APCh. 41 - Prob. 52APCh. 41 - Prob. 53APCh. 41 - Prob. 54APCh. 41 - Prob. 56APCh. 41 - Prob. 57APCh. 41 - Prob. 58APCh. 41 - Prob. 59CPCh. 41 - Prob. 60CPCh. 41 - Prob. 61CPCh. 41 - Prob. 62CPCh. 41 - Prob. 63CP
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Similar questions
- Suppose a wave function is discontinuous at some point. Can this function represent a quantum state of some physical particle? Why? Why not?arrow_forwardIs it possible that when we measure the energy of a quantum particle in a box, the measurement may return a smaller value than the ground state energy? What is the highest value of the energy that we can measure for this particle?arrow_forwardCan we simultaneously measure position and energy of a quantum oscillator? Why? Why not?arrow_forward
- A single particle system in a two-dimensional potential field (Lx = Ly = L). (1) Find the quantum states of the system and their energy values! (II) Determine the number of states whose energy is less than E!arrow_forward= = (1) A particle of mass m in the potential V(x) mw2x2 has the initial wave function: V(x, 0) = Ae-Bε². (a) Find out A. (b) Determine the probability that Eo = hw/2 turns up, when a measurement of energy is performed. Same for E₁ 3hw/2. (c) What energy values might turn up in an energy measurement? [Notice that many n values are ruled out, just as in your answer to (b).] (c) Sketch the probability to measure hw/2 as a function of ẞ and explain the maximum why is it expected to be there, even without performing any calculation?arrow_forwardIt's a quantum mechanics question.arrow_forward
- Which of the following statements is NOT directly from one of the five postulates in quantum mechanics? Wave function has to be finite and single valued O Operators have to be applied to the wave function to predict measurable properties, so called 'observables' of the quantum mechanical particle, i.e. such as position of momentum The probability to find a particle at a given position and time is given by the square modulus of the wave function O The wave function has to be normalizable O No two quantum mechanical particles can occupy the same quantum state calculated by the Schrödinger equationarrow_forwardV (x) = 00, V(x) = 0, x<0,x 2 a 0arrow_forwardRichard Feynman, in his book The Character of Physical Law, states: “A philosopher once said, ‘It is necessary for the very existence of science that the same conditions always produce the same results.’ Well, they don’t!” Who was speaking of classical physics, and who was speaking of quantum physics?arrow_forward2. A free particle (a particle that has zero potential energy) has mass 8 eV/c² and total energy 10 eV and is traveling to the right. At x = 0, the potential jumps from zero to Vo = 5 eV and remains at this value for all positive x. (a) In classical mechanics, what happens to the particle when it reaches x = 0? (b) What is the wavenumber of the quantum particle in the region x > 0? (c) Find the reflection coefficient R and the transmission coefficient T for the quantum particle. (d) If one million particles with this same momentum and energy are incident on this poten- tial step, how many particles are expected to continue along in the positive x direction? How does this compare with the classical prediction?arrow_forwarda) Write down an expression for the probability density ρ(t, x) of a particle described by the wavefunction Ψ(t, x). b) Using the probability density, explain how you would calculate the probability of finding this particle in the interval between x = A and x = B.arrow_forwardassume that an electron is moving along the x-axis and that you measure its speed to be 20.5*10^6m/s, which can be known with of precision of 0.50%. what is the minimum uncertainty (as allowed by the uncertainty principle in quantum theory )with which you can simultaneously measure the position of the electron along the x-axis?arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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