Sodium-vapor lamps are a common source of lighting. The emission spectrum from this type of lamp is shown. Is this a continuous or line emission spectrum?

Key Concepts

Emission Spectrum

An emission spectrum is produced when atoms or molecules emit light at specific wavelengths as they transition from a higher energy state to a lower one. Each element has a unique emission spectrum, which consists of distinct lines corresponding to the wavelengths of light emitted. This spectrum can be used to identify the presence of specific elements in a sample.

Line vs. Continuous Spectrum

A line emission spectrum consists of discrete lines at specific wavelengths, indicating the presence of particular elements, while a continuous spectrum displays a smooth range of wavelengths without gaps. In the case of sodium-vapor lamps, the emitted light produces a line spectrum due to the quantized energy transitions of sodium atoms, which can be visually represented as sharp peaks in the spectrum.

Sodium Vapor Lamps

Sodium vapor lamps are a type of gas discharge lamp that emits light by passing an electric current through vaporized sodium. These lamps are known for their characteristic yellow-orange light and are commonly used in street lighting. The emission spectrum of sodium vapor lamps primarily features strong lines in the yellow region, which are indicative of the sodium element's specific energy transitions.