Which of the following best describes the meaning of the uncertainty principle as applied to an electron bound in an atom?
A) The electron follows a precise path around the nucleus, but it is impossible for us to actually measure this path.
B) The electron is actually a precisely defined sphere surrounding the nucleus rather than a point, which explains why we cannot locate it at a single position.
C) The electron always has a clearly defined position and velocity, but the laws of nature are set up so that, if we measure one, the other becomes instantly hidden from view.
D) The electron does not really exist, and what we perceive as an electron is really just an ill-defined energy field.
E) The electron is both a particle and a wave and is therefore "smeared out" around the nucleus.
E
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A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A) A) 1.7 mT B) 3.4 mT C) 0.85 mT D) 2.0 mT
When a planet retrogrades, it appears to move westward
Indicate whether the statement is true or false
How can the accuracy of a measurement be increased?
Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy. b. is the process by which hydrogen and helium are converted into heavier elements. c. describes the structure of a globular cluster. d. describes how the magnetic field of the galaxy traps cosmic rays. e. describes the method by which neutral hydrogen produces 21-cm radiation.