The magnetic dipole moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
a. r.
b. v.
c. vr.
d. evr.
e. mNvr.
d
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In the simplified Drake equation, a value of flife = 1 would imply that
A) there is one other habitable planet in the galaxy B) all habitable planets in the galaxy have life C) there is one other habitable planet in the galaxy with life on it now D) all habitable planets in the galaxy have life on them now
Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?
a. polarization b. particle nature c. wave nature d. electromagnetic character
The variable r that appears in the equation F = Gm1m2/r2 is
a. the straight-line distance between the centers of the two masses. b. the rate at which both objects are moving. c. the radius of the first mass. d. the radius of the second mass.