Suppose we use optical radiation (l = 500 nm) to determine the position of the electron to within the wavelength of the light. What will be the resulting uncertainty in the electron's velocity?
116 m/s
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A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is attracted toward the rod we can conclude:
A) the object is positively charged B) the object is negatively charged C) the object is an insulator D) the object is a conductor E) none of the above
In the Hertzprung—Russell diagram most stars are found
A) on the main sequence B) in the red giant region C) in the white dwarf region D) in the supergiant region
Any indication of prehistoric life preserved in rock is called
a. a shale. b. a radionuclide. c. a fossil. d. none of these.
In the inductor of a 60-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what time interval?
a. 2.1 × 10^-3 s c. 4.2 × 10^-3 s b. 8.3 × 10^-3 s d. 1.7 × 10^-3 s