Question

The wavelength of blue lights is 450nm. This can be written as A.450x10^-9mB.4.5x10^-7mC.4500AD.all answers are correct

Answer 1

Given,

The wavelength of the blue light, λ=450 nm

One nanometer is equal to 10⁻⁹ meters.

Thus,

`450\text{ nm = 450}*10^(-9)\text{ m}`

Which can also be written as,

`450*10^(-9)m=4.50*10^(-7)\text{ m}`

One nanometer is equal to 10 angstrom.

Thus,

`450\text{ nm=}450*10=4500\text{ }\mathring{\text{A}}`

Therefore the correct answer is option D.