If the Escape Speed of a Star Is Equal to the Speed

question 1

Multiple Choice

If the escape speed of a star is equal to the speed of light,its radius is the so-called Schwarzschild radius.What is the Schwarzschild radius of the sun,whose mass is 2.0 $\times$ 10³⁰ kg?

• A) 4.5 km
• B) 1.5 km
• C) 5.9 km
• D) 3.0 km

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