<u>Answer:</u>
Option (3)
The arms mostly contains old blue and blue-white stars
<u>Explanation:</u>
Spiral arms are the regions in stars extending from the middle of spiral galaxies and the barred spiral. Those long, thin areas look like a spiral and therefore give their name to spiral galaxies.
Spiral arms, though, include many young, blue stars, that render their arms so bright (due to the high mass density and the fast stellar forming rates).
Answer:
16 KJ or 16,720 J energy has gained by the water.
Explanation:
<em>Given data:</em>
Mass of water = m = 100 g
Temperature difference = ΔT= (60 - 20)∘C
specific heat of water 1 calorie = c = 4.18 J
<em>To find:</em>
Heat absorbed by water = q=?
<em>Formula:</em>
q = m . c . ΔT
<em>Solution:</em>
q = (100 g) x (4.18J/g ∘C) x (60 - 20)∘C
= 16,720 J
