Question

The wavelength of yellow line of sodium is 5896 Å. Its wave number will be.

• A. 50883 × 10¹⁰ per second
• B. 16961 per cm
• C. 17581 per cm
• D. 50883 per cm

Answer 1

Answer: (B)

16961 per cm

Answer 2

Wave number $\bar{\nu} = \frac{1}{\lambda} = \frac{1}{5896 \times 10^{- 8}} = 16961$per cm.