Question

When a sodium lamp emits yellow light having wavelengths 589 nm and 589.56 nm, the spectrum obtained on analysis is:

• A. Continuous spectrum in yellow colour range
• B. Line Spectrum with two lines
• C. A band spectrum
• D. None of these

Answer 1

The correct option is B Line Spectrum with two lines

Sodium lamp emits just two wavelengths of 589 and 589.56 nm and hence its spectra will be a line spectra with only two lines.