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,

$450\text{ nm = 450}\times10^{-9}\text{ m}$

Which can also be written as,

$450\times10^{-9}m=4.50\times10^{-7}\text{ m}$

One nanometer is equal to 10 angstrom.

Thus,

$450\text{ nm=}450\times10=4500\text{ }\mathring{\text{A}}$

Therefore the correct answer is option D.