Physics for Scientists and Engineers with Modern Physics, Technology Update
Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 41, Problem 6CQ
To determine

The reason for the existence of lower value of E than potential energy in quantum mechanics, but it is impossible in classical mechanics.

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4. In this question we will be applying the knowledge we gained drom the Finite Potential Step to the system below :  (see figure below)  This potential takes the value V = 0eV when x < 0  , the value V = V0 when 0 < x < L  , and the value −V0 when  x > L . A beam of electrons with energy E  is incident upon it from the left .  A ) According to classical physics , what is the probability that electrons with energy E < V0 will make their way past this barrier ? Explain your answer .
3. Everyone knows the joke of the policeman stopping Heisenberg, who was speeding, and ask him: "Do you know how fast you were going?" Then Heisen- ber replies: "No, but I know exactly where I am." Now let's investigate the truth behind this story in more detail. Heisenberg was actually late for his quantum mechanics class and was stopped by a police officer for speeding his Merc, weighing 4000 kg, at v = 200 km/h in downtown Leipzig (Germany). The radar detector measured the speed us- ing the Doppler effect, with an uncertainty of 1%. With what fundamental accuracy could the officer have located Heisenberg's position, if this was mea- sured simultaneously with the speed? Remember that Planck's constant is h = 6.63 x 10-34 J s.
If measurements show a precise position for an electron, can those measurements show precise momentum also? Explain.

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Physics for Scientists and Engineers with Modern Physics, Technology Update

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