Question

Question 2.23 The Sun is a hot plasma (ionized matter) with its inner core at a temperature exceeding 107 K, and its outer surface at a temperature of about 6000 K. At these high temperatures, no substance remains in a solid or liquid phase. In what range do you expect the mass density of the Sun to be, in the range of densities of solids and liquids or gases? Check if your guess is correct from the following data: mass of the Sun = 2.0 × 1030 kg, radius of the Sun = 7.0 × 108 m.

Chapter Units And Measurements Page 37

Answer 1

Q3.
Mass of the sun = 2 × 10^30 Kg
Radius of the sun = 7 × 10^8 m

Density of the sun = mass of the sun /volume of the sun
= mass of the sun/4/3π(radius of the sun)³
= 2 × 10^30/{4/3 × 3.14 × (7× 10^8)³}
= 6 × 10^(30 -24)/{4 × 3.14 × 343}
= 1392.71 Kg/m³
Density of the sun = 1392.71 kg/m³
Hence, range of density of the sun is comparable to solid or liquid not gases .

Again, we see temperature in the surface of the sun is 6000K and core of the sun is 10^7 K . there doesn't exist any metal or liquid between this temperature but ionised state of matter exists . hence , the sun is formed by ionised state ( plasma ) of matter .