The kinetic energy of the electron in the first Bohr orbit of hydrogen is 2.18 × J
Indicate whether the statement is true or false
TRUE
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In order, from top to bottom, in the activity series come K, Zn, Pb, H, Cu, and Au. Therefore,
a. adding Pb to ZnCl2 will release Zn. b. adding Cu to HCl will release hydrogen. c. adding Au to HCl will release hydrogen. d. adding Cu to AuCl3 will release Au.
A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. The current has the same value for each section of the wire, so charge does not accumulate at any one point. How does the resistance per unit length vary along the wire as the area becomes smaller?
1.It increases. 2.It decreases. 3.It remains constant.
For a few hundred thousand years after the Big Bang, atoms could not form. Electrons could not stay bound to protons or helium nuclei. However, eventually, atoms did combine when
A. there was enough angular momentum that protons and electrons acquired spins. B. the universe had expanded and cooled sufficiently. C. the theory of everything became active. D. the curvature of spacetime increased by 50%.
Alfred Wegener speculated that the present continents were once part of a single supercontinent that he named
a. Landusia. b. Atlantis. c. Pangaea. d. Gondaland.