Explanation 1) Concept: We find the total energy of the electron and the wave number in region 1. Finding the value of b and substituting in transmission coeffient formula, we can find the transmission coefficient of the barrier. Taking the product of transmission coefficient and the initial current of region 1, we can find the transmitted current in region 2. 2) Formula: i) E = 1 2 m v 2 ii) k = 2 π λ iii) T = e - 2 b L iv) b = 8 π 2 m U b - E h 2 v) T = I t I 0 3) Given: i) Speed of electrons v = 1.200 × 10 3 m s ii) Current I 0 = 9.000 m A iii) Height of potential barrier U b = - 4.719 μ V iv) Thickness L = 200.0 n m 4) Calculations: The energy of the electron in the region 1 is E = K + P . E E = 1 2 m v 2 + 0 E = 1 2 ( 9.11 × 10 - 31 k g ) 1.2 × 10 3 m s 2 E = 6.56 × 10 - 25 J E = 4.0995 μ e V The wave number in region 1 is k = 2 π λ The de-Broglie wavelength is λ = h p k = 2 π p h The linear momentum p = m v k = 2 π m v h k = 2 π ( 9.11 × 10 - 31 k g ) ( 1200 m s ) 6

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Chapter 38, Problem 78P

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To find:

Transmitted current.

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Chapter 38, Problem 77P

Chapter 38, Problem 79P

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4. In the figure below what is the value of the angle 0? A 30

PLEASE help with the experimental setup for this theory because i am so confused.

Part 2 - Geometry and Trigonometry 1. Line B touches the circle at a single point. Line A extends radially through the center of the circle. A B (a) Which line is tangential to the circumference of the circle? (b) What is the angle between lines A and B. 2. In the figure below what is the angle C? 30 45 3. In the figure below what is the value of the angle 0? 30° 4. In the figure below what is the value of the angle 0? A 30°

Chapter 38 Solutions

FUNDAMENTALS OF PHYSICS,AP ED.

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