Question

Question No.10
The wave number for light with a wavelength of 2.0x100 cm is
5x 11-11cm-1
5 x 10-11cm-1
o
o
5 x 10-12 cm-1
5 x 1012 cm -1
​

Answer 1

Explanation:

the wavenumber is the reciprocal of wavelength.

thus

wavenumber = 1 / 2 * 10 ^10

wavenumber = 0.5 * 10 ^-10

= 5 * 10 ^-11 cm-1