Question

the wavelength of light of a particular colour is 5800Å.Express it in nanometre and metre

Answer 1

a) 5800 Armstrong = 580 nm
b) 5800 Armstrong = 5.8 × 10 ^-7 m
.........

Answer 2

Given wavelength of light = 5800 Å
1 Å = 1/10 nm
5800 Å = 5800*1/10 = 580 nm

Similarly
1 Å = 10^-10 m
5800 Å = 5800*10^-10 m
             = 5.8*10^-7 m

Hope this helps you.