Choose the best answer to each of the following. Explain your reasoning with one or more complete sentence.
Which of these objects has the smallest radius?
(a) a 1.2M Sun white dwarf
(b) the event horizon of a 3.0M Sun black hole
(c) the event horizon of a 10M Sun black hole
Step 1 of 2:-
Here we have to explain , which of the given objects has the smallest radius.
The options given are, 1.2 solar mass white dwarf, the event horizon of a 3 solar mass black hole and the event horizon of 10 solar mass black hole.
The white dwarf stars are formed after the death of a star whose mass is not sufficient to become a black hole. So, just after the death the star becomes a white dwarf. The mass of it is comparable to sun, but the size is comparable to earth.
So, the radius is significant.