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Chapter 39: Wave Functions and Uncertainty

Q. 1

Page 1136

FIGURE Q 39.1 shows the probability density for photons to be detected on the x-axis.

a. Is a photon more likely to be detected at x = 0 m or at x=1 m? Explain.

b. One million photons are detected. What is the expected number of photons in a 1 mm-wide interval at x = 0.50 m?

Q.1.

Page 1136

FIGURE Q39.1 shows the probability density for photons to be detected on thex-axis.

a. Is a photon more likely to be detected at x=0mor at x=1m ? Explain.

b. One million photons are detected. What is the expected number of photons in a 1−mm-wide interval at x=0.50m?

Q 11 Exercise

Page 1136

In an interference experiment with electrons, you find the most intense fringe is at x = 7.0 cm. There are slightly weaker fringes at x= 6.0 and 8.0 cm, still weaker fringes at x = 4.0 and 10.0 cm, and two very weak fringes at x= 1.0 and 13.0 cm. No electrons are detected at x <0 cm or x> 14 cm.

a. Sketch a graph of |ψ(x)|2is for these electrons.

b. Sketch a possible graph of ψ(x).

c. Are there other possible graph forψ(x)? If so draw one

Q.12

Page 1137

The probability density for an electron that has passed through an experimental apparatus. If 1.0×106electrons are used, what is the expected number that will land in alocalid="1649312933417" 0.010mmwide strip atlocalid="1649312941736" (a)x=0.000mmand localid="1649312949893" (b)2.000mm?

Q.13

Page 1137

shows the probability density for an electron that has passed through an experimental apparatus. What is the probability that the electron will land in a 0.010-mm-widestripatax=0.000mm,bx=0.500mm,cx=1.000mm,anddx=2.000mm?xmm-3-2-101230.50px=0cx02mm-1

Q. 13

Page 1137

3 shows the probability density for an electron that has passed through an experimental apparatus. What is the probability that the electron will land in a 0.010-mm-wide strip at (a) x = 0.000 mm, (b) x = 0.500 mm, (c) x = 1.000 mm, and (d) x = 2.000 mm?

Q 1 Exercise

Page 1136

An experiment has four possible outcomes, labeled A to D. The probability of A is PA= 40% and of B is PB = 30%. Outcome C is twice as probable as outcome D. What are the probabilities PCand PD?

Q.22

Page 1137

A thin solid barrier in the xy-plane has a 10μmdiameter circular hole. An electron traveling in the zdirection with vx=0m/spasses through the hole. Afterward, is it certain that vxis still zero? If not, within what range is vxlikely to be?

Q.23

Page 1137

Andrea, whose mass is 50kg, thinks she’s sitting at rest in her 5.0mlong dorm room as she does her physics homework. Can Andrea be sure she’s at rest? If not, within what range is her velocity likely to be?

Q.23b.

Page 1137

Andrea, whose mass is 50kg, thinks she's sitting at rest in her 5.0-m-long dorm room as she does her physics homework. Can Andrea be sure she's at rest? If not, within what range is her velocity likely to be?

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