An electron of momentum p is at a distance r from a stationary proton. the system has a kinetic energy k p2/2me and potential energy u ke2/r. its total energy is e k u. if the electron is bound to the proton to form a hydrogen atom, its average position is at the proton but the uncertainty in its position is approximately equal to the radius, r, of its orbit. the electron’s average momentum will be zero, but the uncertainty in its momentum will be given by the uncertainty principle. treat the atom as a one-dimensional system in the following: (a) estimate the uncertainty in the electron’s momentum in terms of r. (b) estimate the electron’s kinetic, potential, and total energies in terms of r. (c) the actual value of r is the one that minimizes the total energy, resulting in a stable atom. find that value of r and the resulting total energy. compare your answer with the predictions of the bohr theory.
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Physics, 22.06.2019 02:50
20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.
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Physics, 22.06.2019 10:40
Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v
Answers: 1
Physics, 22.06.2019 22:00
Aspaceship starting from a resting position accelerates at a constant rate of 9.8 meters per second per second. how far will the spaceship travel if its final speed is 1 percent the speed of light (300,000,000 m/s)? a. 3.1 × 106 m b. 2.94 × 108 m c. 7.8 × 1010 m d. 4.6 × 1013 m
Answers: 1
Physics, 22.06.2019 22:00
Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)
Answers: 1
An electron of momentum p is at a distance r from a stationary proton. the system has a kinetic ener...
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