The fact that the universe is expanding means that space itself is growing within
A) the Milky Way.
B) clusters of galaxies.
C) the observable universe.
D) the Local Group.
C
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A photon of energy 4eV is incident on a metal surface whose work function is 2eV. The minimum reverse potential to be applied for stopping the emission electrons is
a) 2V b) 4V c) 6V d) 8V
A gas of electrons and protons or other nuclei is called a(n) ______________
Fill in the blank(s) with correct word
One mole of "o" gas is confined to volume V/2 by a thin membrane with another mole of "o" gas on the other side. Both gases are at the same temperature
The primary purpose of a lightning rod is to
A) attract lightning and guide it to the ground. B) discharge the structure to which it is attached. C) cancel the electric field within the structure to which it is attached. D) induce a charge opposite to that of charged clouds overhead.