Question

the greater the lateral area of a florescent light bulb, the more light the bulb produces. one cylindrical light bulb is 16 inches long with a 1-inch radius. Another cylindrical bulb is 23 inches long with a 3/4- inch radius. which bulb will produce more light?

Answer 1

Lateral area = 2 pi r l           (r = radius and l = length)

so lateral area of r first light = 2 * pi * 1*16

and for second its 2 * pi * 1/3 * 23