Question

what is the wave nomber of radiation having wavelength 2000A°​

Answer 1

Answer:

Wave number= 1/wavelength =(1/2000 )×10^10 =(10000/2… ...

Explanation:

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Answer 2

Given :

Wavelength (λ) = 2000Å

To Find :

The wave number

Solution :

We know,

                  Wave number = $\frac{1}{Wavelength}$

As the wavelength is given in Angstrom, we need to convert it in meters.

1 Å = $10^{-10}$ m

so, 2000Å = 2000 ×  $10^{-10}$ m = 2 × $10^{-7}$ m

∴ Wave number = $\frac{1}{2 * 10^-^7}$

                           = $\frac{10^{7} }{2}$

                           = 5×$10^{6}$ $m^-^1$

Therefore, The wave number of radiation having wavelength 2000 Å is 5×$10^{6}$ $m^-^1$.