Question

The wavelength of a light is of the order of `6400 Å`. Express this in micron and metre.
A. `0.64` micron
B. 0.84 micron
C. 0. 24 micron
D. 0. 34 micron

Answer 1

Correct Answer - A
As, `1 Å=10^(-10)`
`:.` Wavelength of light `=6400 Å=6400xx10^(-10)m=6.4xx10^(-7)m`
Also 1 micron`=10^(-6)`metre
Wavelength of light (in micron) `=(6.4xx10^(-7))/(10^(-6))`micron `=0.64` micron