A Level Physics Practice Exam

Which of the following is a use of spectrometers?

1. Temperature measurement

2. Spectral analysis of light from stars

3. Force measurement

4. Distance measurement

The correct answer is: Spectral analysis of light from stars

A spectrometer is a crucial instrument used to analyze the properties of light and other electromagnetic radiation. One of its key applications is in the spectral analysis of light emitted from various sources, including stars. By dispersing the light into its component wavelengths, a spectrometer allows scientists to study the spectra produced. This analysis can reveal essential information about the chemical composition, temperature, density, and motion of celestial objects. When light from a star passes through a spectrometer, it can be split into different colors or wavelengths. This spectral information includes absorption and emission lines that correspond to different elements, enabling astronomers to determine what elements are present in the star and even estimate its temperature. Thus, this application of spectrometers in studying astronomical bodies is fundamental in astrophysics and contributes to our understanding of the universe. The other options refer to different measurement techniques that are not related to the function of a spectrometer. For instance, temperature measurement typically uses thermometers or thermocouples, force measurement involves devices such as load cells or spring scales, and distance measurement can utilize tools like rulers, laser rangefinders, or GPS systems. Each of these has its own specialized instruments, distinct from the functions of a spectrometer, which focuses specifically on the analysis of