Show that the intensity of light at distance r from the axis of a long cylindrical source is inversely proportional to r.

The mean free path of a molecule of a gas (radius r)is inversely proportional to:

If the area of a circle increases uniformly, then show that the rate of increment of its circumference is inversely proportional to its radius.

Show that if at some part of a field the lines of force have the form of arcs of concentric circles whose centres are at point O (Fig.), the field intensity at each point in this part of the field should be inversely proportional to the distance from the point to O.

What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characterstics of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb.

Derive an expression for the rise of liquid in a capillary tube and show that the height of the liquid column supported is inversely proportional to the radius of the tube.

Show that v=r omega .

The force of attraction between two point masses is proportional to the product of their mases and inversely proportional to the distance between them. (T or F)

For light diverging from a point source.