Star Spectra - Practice

Front

What is a star spectrum?

Back

A star spectrum is a representation of the light emitted or absorbed by a star, showing the specific wavelengths of light and their intensities.

Front

What are emission and absorption spectra?

Back

Emission spectra are produced when a gas emits light at specific wavelengths, while absorption spectra occur when light passes through a gas and certain wavelengths are absorbed.

Front

How do scientists use star spectra?

Back

Scientists use star spectra to determine the composition, temperature, and movement of stars.

Front

What does redshift indicate about a star's movement?

Back

Redshift indicates that a star is moving away from the observer, suggesting that the universe is expanding.

Front

What is the significance of the Doppler effect in astronomy?

Back

The Doppler effect explains how the wavelength of light changes due to the motion of stars, helping to determine their speed and direction.

Front

What elements can be identified in a star's spectrum?

Back

Elements such as hydrogen, helium, and heavier elements can be identified in a star's spectrum based on their unique spectral lines.

Front

What does a continuous spectrum represent?

Back

A continuous spectrum represents a range of wavelengths without any gaps, typically emitted by solid, liquid, or densely packed gases.

Front

What is the relationship between temperature and color in stars?

Back

The color of a star is related to its temperature; hotter stars appear blue, while cooler stars appear red.

Front

What is luminosity in the context of stars?

Back

Luminosity is the total amount of energy emitted by a star per unit of time, often measured in watts.

Front

How can the distance to a star be determined using its spectrum?

Back

The distance to a star can be estimated using its spectrum in conjunction with the redshift and the Hubble's law.