The Yellow Line of a Sodium Lamp Is Two Lines $\lambda$

question 58

Multiple Choice

The yellow line of a Sodium lamp is two lines very close together at $\lambda$ ₁ = 589.592 nm and $\lambda$ ₂ = 588.995 nm.If a diffraction grating has to resolve the first order diffraction lines by an angular separation of 0.1 ^$\circ$ ,what is the least number of lines per cm for the diffraction grating?

• A)12,400 cm^-1
• B)13,600 cm^-1
• C)14,700 cm^-1
• D)15,300 cm^-1
• E)16,700 cm^-1

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