radius ratio

For the stability of an ionic compound, each cation should be surrounded by maximum number of anions and vice versa. The number of oppositely charged ions surrounding each ion is called its co-ordination number. The larger is the size of the cation the greater is its coordination number. In other..

The radius of the cylinder is equal to the radius of the sphere in the figure. What is the ratio of the surface area of the sphere to the surface area of the cylinder? => 2 : 5 or 1 : 2 or 1 : 4 or 1 : 3..

What is the ratio of the surface area of a sphere with radius 1 in. to the surface area of a sphere with radius 2 in.? => 1 : 5 or 1 : 4 or 4 : 1 or 3 : 2..

What is the ratio of volumes of a cone of radius 28 cm and height 42 cm to a cylinder of radius 7 cm and height 14 cm? [Take π = 3.] => 16 : 1 or 22 : 1 or 21 : 1 or 24 : 1..

Find the ratio of surface area to volume of a cone submersible with height and radius equal to y . => 2 + 1 3 y or 1 y or 3 ( 2 + 1 ) y or 9 y..

Find the ratio of the total surface area of a hemisphere to its volume. Let r be the radius of the sphere. => 1 2r or 2 r or 9 2r or 3 2r..

Radius( r ) of the inner most circle is 13 cm. Radius of the each consecutive circle increases by ( a = 4 cm). Find the ratio of the area of the outer most ring to the inner most ring. => 3 2 or 9 5 or 2 or 5 9..

> Again from the right angled triangle ABD body diagonal But as shaded sphere touches other spheres evidently body diagonal AD = 2(R + r) Dividing equation (ii) by equation (i) we g..

We observe A"B" > A'B' > AB, denominator remains 'r' (radius). As the angle increases sine ratio increases. We observe OB'' < OB' < OB, denominator remains r. As the angle increases cosine ratio decreases, When a = ..