Beginning with the equation, ρR = ρsubstance /ρwater show that , Relative Density = mass of substance / mass of water
i. e ρR = msubstance /mwater , if the volume are equal
( you must prove that the equation is true)​

we know,

let the mass of substance be

and volume be

density of substance :

now, let the mass of water be

and volume be

density of water :

relative density :

since, volume is same they would cancel off

proved...

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length