(a) Order of magnitude is defined as the power of 10 used to express the magnitude of a physical quantity under consideration, e.g.,

(i) Order of magnitude of time intervals of 1.2 x ${{10}^{-6}}$s

is-6.

(ii) Order or magnitude of distance of 4.5 x ${{10}^{6}}$

is + 6.

(b) 1 light year = 9.46 x ${{10}^{15}}$ m = ${{10}^{16}}$ m

Order of magnitude of light year is 16

# What do you mean by 'order of magnitude' ? (b) Find the order of magnitude of light year

**prasanna**#1