8.PS.1.2-Spectral Lines-Composition of Elements in Stars

Multiple Choice

What is the main target of learning in the topic of Spectroscopy as mentioned in the slide?

• To understand the spectrum of visible light

• To explain the relation between emission and absorption lines and describe what we can learn from those lines

• To study the intensity of light in spectroscopy

• To analyze the different colors in the spectrum

Multiple Choice

What is a spectroscope?

• A device that combines different frequencies of light into a single beam.

  
  

• A device that amplifies light to see distant objects.

  
  

• A device that detects the intensity of light.

  
  

• A device that splits a beam of radiation into its component frequencies.

  
  

Multiple Choice

What are emission lines?

• A full spectrum of light emitted by all atoms.

  
  

• The colors visible in a rainbow.

  
  

• Single frequencies emitted by specific atoms.

  
  

• Patterns formed by the interference of light waves.

  
  

Shows us the way light is traveling.

REDSHIFT- traveling away

BLUESHIFT- traveling towards

Doppler Effect of Light

On a visible light spectra, absorption lines shifted towards the violet show a blue shift and absorption lines shifted towards the red show a redshift.

SPECTRA

Just as the visible light spectra shows how light travels, star spectra shows the composition of stars. Spectroscopes are devices that measure the spectrum of light. While helium and hydrogen are the most common elements found in stars, there are other elements that make up a star as well.

A shifted spectra shows which way the star is traveling.

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This star is composed of the elements hydrogen and helium.

Star Spectra

Multiple Choice

A spectroscope is tool that is used to

• see objects in far away galaxies

• show how the stars are moving toward each other

• show the composition of stars with spectral lines

• see how stars go through different stages of life

Multiple Choice

Which elements are found in this star?

• hydrogen, calcium, and magnesium

• calcium, helium, and hydrogen

• hydrogen, helium, and magnesium

• magnesium, calcium, and helium

Multiple Choice

The top image is first. What does the change from the first image tell us?

• There is no change from the first to the second image.

• The second image has shifted more toward the blue wavelength.

• The second image has shifted more toward the red wavelength.

Multiple Choice

Which elements are present in unknown star #272-B?

• Helium, Hydrogen, Oxygen, Sulfur, Iron

• Helium, Hydrogen, Sulfur, Iron, Gold

• Helium, Hydrogen, Silver, Sulfur, Iron

• Helium, Hydrogen, Oxygen, Silver, Iron

Multiple Choice

Which claim can you support based on the change from diagram 1 to 2?

• Size of the galaxy is increasing.

• The galaxy is moving toward Earth.

• Temperature of the Sun is cooling.

• The universe is expanding.