Wave number of an electromagnetic radiation whose wavelength is 2000 A is:

4 \times 10^{5} c m^{- 1}

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2 \times 10^{3} c m^{- 1}

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6 \times 10^{6} c m^{- 1}

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5 \times 10^{4} c m^{- 1}

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Solution

The correct option is D $5 \times 10^{4} c m^{- 1}$
Wavelength $= 2000 o A$
Wave number $= \frac{A}{2000 o A}$
$I = \frac{1}{2000 \times 10^{- 8}} c m^{- 1}$
$= \frac{10000}{2000} \times 10^{4} = 5 \times 10^{4} c m^{- 1}$ .

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Wave number of an electromagnetic radiation whose wavelength is 2000 A is:

The correct option is D 5×104cm−1Wavelength =2000oAWave number =A2000oAI=12000×10−8cm−1=100002000×104=5×104cm−1.

The correct option is D $5 \times 10^{4} c m^{- 1}$
Wavelength $= 2000 o A$
Wave number $= \frac{A}{2000 o A}$
$I = \frac{1}{2000 \times 10^{- 8}} c m^{- 1}$
$= \frac{10000}{2000} \times 10^{4} = 5 \times 10^{4} c m^{- 1}$ .