Question

Arrange the following units in decreasing order: nm,km,pm,Dm,mm,m,cm,hm,gm

Answer 1

The units are nm (nano-meter), km (kilo-meter), pm (pico-meter), dm (decimeter), mm (millimeter), m (meter), cm (centimeter), hm (hectometer) and gm (gigameter). Now we can express each of these units in terms of m.

1 nm =
`10^(-9)m`, 1 Km =
`10^(3)m` 1 pm =
`10^(-12)m`, 1 dm = 0.1 m, 1 mm = 0.001 m, 1 cm = 0.01 m, 1 hm = 100 m, 1 gm =
`10^(9) m`. Thus the decreasing unit will be

gm>km>hm>m>dm>cm>mm>nm>pm