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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The Schwarzschild radius (R_s) is calculated using the formula R_s = 2GM/c^2. For the sun, with G = 6.674 x 10^-11 m^3 kg^-1 s^-2, M = 2.0 x 10^30 kg, and c = 3.0 x 10^8 m/s, R_s ≈ 3.0 km.

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