Unit 4 Day 15: Star Spectra - Practice

Front

What are the two main gases that make up most of the sun?

Back

Helium and Hydrogen

Front

What is the primary use of emission/absorption spectra in astronomy?

Back

To identify the composition of stars.

Front

What does blue shifting in a star's spectrum indicate?

Back

The star is moving towards the observer.

Front

What is the significance of star spectra in understanding the universe?

Back

They help determine the composition, temperature, and movement of stars.

Front

What is the difference between emission and absorption spectra?

Back

Emission spectra show bright lines at specific wavelengths, while absorption spectra show dark lines where light has been absorbed.

Front

How can we determine the speed of a star moving towards us?

Back

By analyzing the shift in its spectral lines.

Front

What is a spectrum?

Back

A spectrum is a range of different colors or wavelengths of light emitted or absorbed by an object.

Front

What does the term 'luminosity' refer to in astronomy?

Back

The total amount of energy emitted by a star per unit of time.

Front

What is the role of spectroscopy in astronomy?

Back

Spectroscopy allows astronomers to analyze light from stars to determine their properties.

Front

What is the Doppler effect in relation to light?

Back

The change in frequency or wavelength of light from a source moving relative to an observer.