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Ch 39: Wave Functions and Uncertainty
Knight Calc - Physics for Scientists and Engineers 5th Edition
Knight Calc5th EditionPhysics for Scientists and EngineersISBN: 9780137344796Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoKnight Calc 5th EditionCh 39: Wave Functions and UncertaintyProblema 31d
Capitolo 39, Problema 31d

FIGURE P39.31 shows the wave function of a particle confined between x = 0 nm and x = 1.0 nm. The wave function is zero outside this region. Calculate the probability of finding the particle in the interval 0 nm ≤ x ≤ 0.25 nm.

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Step 1: Understand the problem. The wave function ψ(x) represents the probability amplitude of a particle confined between x = 0 nm and x = 1.0 nm. The probability of finding the particle in a specific interval is calculated using the integral of the square of the wave function over that interval.
Step 2: Analyze the graph. The wave function ψ(x) is a triangular function that starts at ψ(0) = 0, increases linearly to a maximum value of c at x = 0.5 nm, and then decreases linearly back to ψ(1) = 0. The function is zero outside the region 0 ≤ x ≤ 1 nm.
Step 3: Write the expression for the probability. The probability of finding the particle in the interval 0 nm ≤ x ≤ 0.25 nm is given by: P = ∫[0 to 0.25] |ψ(x)|² dx. Since ψ(x) is linear in this region, its equation can be determined using the slope-intercept form of a line.
Step 4: Determine the equation of ψ(x) for 0 ≤ x ≤ 0.5 nm. The slope of the line is m = c / 0.5 = 2c. Thus, ψ(x) = 2cx for 0 ≤ x ≤ 0.5 nm. Substitute this into the probability expression: P = ∫[0 to 0.25] (2cx)² dx.
Step 5: Simplify the integral. Expand (2cx)² to get 4c²x². The integral becomes P = ∫[0 to 0.25] 4c²x² dx. Solve this integral by applying the power rule for integration: ∫x² dx = (x³ / 3). After integrating, evaluate the result at the limits x = 0 and x = 0.25.

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Wave Function

The wave function, denoted as ψ(x), describes the quantum state of a particle in a given region. It contains all the information about the particle's position and momentum. The square of the wave function's absolute value, |ψ(x)|², gives the probability density of finding the particle at a specific position within the defined boundaries.
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Intro to Wave Functions

Probability Density

Probability density is a measure derived from the wave function that indicates the likelihood of finding a particle in a particular region of space. For a one-dimensional case, it is calculated as |ψ(x)|². To find the probability of locating the particle within a specific interval, one must integrate the probability density over that interval.
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Intro to Density

Normalization of the Wave Function

Normalization ensures that the total probability of finding the particle within the entire space is equal to one. This is achieved by integrating the probability density over the entire range of the wave function and setting the result equal to one. A properly normalized wave function is essential for accurate probability calculations in quantum mechanics.
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Intro to Wave Functions
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