Question no. 10

10.  The wave number of radiation of wavelength 500 nm is
        ( A )   5   ×   10 - 7   m - 1                           ( B )   2   ×   10 7   m - 1                                   ( C )   2   ×   10 6   m - 1                                 ( D )   500   ×   10 - 9   m - 1

C is the answer.
Wavelength = 500 * 10^-9 m
Wavenumber is 1/ wavelength
= 1/500 * 10^9
= 2* 10^6

  • 5
Option c 2×10^6
  • 1
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