Answer: Option (c) is the correct answer.
Explanation:
Density is the measure of mass per liter of volume. The formula to calculate density is as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
A substance with less density is the least dense and vice versa.
The density of rock is calculated as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
= [tex]\frac{1000g}{0.5 L}[/tex]
= 200 g/L
The density of pillow is calculated as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
= [tex]\frac{200g}{10 L}[/tex]
= 20 g/L
The density of bottle of soda is calculated as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
= [tex]\frac{2000g}{2 L}[/tex]
= 1000 g/L
The density of loaf of bread is calculated as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
= [tex]\frac{100g}{1 L}[/tex]
= 100 g/L
Thus, we can conclude that loaf of bread and pillow are the least dense materials shown.
