How many electrons can be found with principal quantum number n = 3 in a suitably heavy atom?
A) 18
B) 6
C) 20
D) 9
A
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A copper and an aluminum part are bolted together as shown. Estimate the rate of diffusion of copper into the aluminum if the copper mass fraction is 0.1% at 2 mm into the aluminum at a particular time, and the diffusivity is the same as that at 500ºC.
The diameter of a typical atom is about ________ the diameter of its nucleus.
A) the same as B) 10 times C) 100 times D) 1/10 of E) 100,000 times
In quantum mechanics there is a process by which an electron can start in a region of relatively weak forces, enter a classically forbidden region, and then reemerge on the other side of that region. The electron, it can be said, travels through a "wall." How do scientists commonly refer to this process?
Give an example in which there are clear distinctions among distance traveled, displacement, and magnitude of displacement. Specifically identify each quantity in your example.
A. Going from home to College, we make various turns on the road along the way and the total odometer reading is the total distance travelled. However the straight-line distance from home to College is the displacement in magnitude in that particular direction. B. Going from home to College, we make no turns on the road along the way and the total odometer reading is the total distance travelled. However the straight-line distance from home to College is the speed in magnitude but not in any particular direction. C. Going from home to College, we make no turns on the road along the way and the total odometer reading is the total distance travelled. However the circular-line distance from home to College is the displacement in magnitude but not in any particular direction.