Question

The wavelength of an electromagnetic radiation is
400 nm. Thus, the wave number will be equal to
[NCERT Pg. 38]
(1) 2.5 x 104 cm-1 (2) 2.5 103 cm-1
(3) 2.5 x 105 cm-1 (4) 2.5 x 102 cm-1​

Answer 1

multiplied with 10^-2 cause they asked in cm-1 not in m-1