The Schwarzschild radius of a black hole is that radial distance from the center of a sphere within which not even light can escape.
It was first discovered mathematically by Schwarzschild in 1916 after Einstein published his general relativity theory. It can be calculated from a star's mass M as: R = 2GM/c2. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be A)
the same.
B)
twice as much.
C)
half as much.
D)
four times as much.
E)
one-fourth as much.
Question 2
The reason the position of a particle cannot be specified with infinite precision is the
A)
coherence principle.
B)
exclusion principle.
C)
uncertainty principle.
D)
photoelectric effect.
E)
principle of relativity.
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