Question

red light has a wavelength of 7000 å. in μm it is a)0.7μm b)7μm c)70μm d)0.07μm​

Answer 1

Given Wavelength of red light is 7000Å

• First simplify

$\\ \sf\longmapsto 7000Å$

$\boxed{\sf 1Å=10^{-10}m}$

$\\ \sf\longmapsto 7000\times 10^{-10}m$

$\boxed{\sf 1\mu m=10^{-6}m}$

• Simplify

$\\ \sf\longmapsto 7000\times 10^{-10}m$

$\\ \sf\longmapsto 7\times 10^{-7}m$

$\\ \sf\longmapsto 0.7\times 10^{-6}m$

$\\ \sf\longmapsto 0.7\mu m$

Answer 2

$\huge\dag\mathbb\pink{solution}\dag$

Given Wavelength of red light is 7000Å

• First simplify

$\begin{gathered}\\ \sf\longmapsto7000Å\end{gathered}$$\boxed{\sf 1Å=10^{-10}m}$$\begin{gathered}\\\sf\longmapsto 7000\times 10^{-10}m\end{gathered}$$\boxed{\sf 1\mu m=10^{-6}m}$

Simplify

$\begin{gathered}\\\sf\longmapsto 7000\times 10^{-10}m\end{gathered}$$\begin{gathered}\\ \sf\longmapsto 7\times 10^{-7}m\end{gathered} </p><p>$$\begin{gathered}\\\sf\longmapsto 0.7\times 10^{-6}m\end{gathered}$

$\begin{gathered}\\\sf\longmapsto 0.7\mu</p><p>m\end{gathered}$

$\huge\dag\mathbb\purple{option (a) \: \: \: ✔}\dag$