Unknown Star Spectral Lines

The Sun's spectrum contains spectral lines from neutral sodium and calcium as well as ionized magnesium and iron. Of the choices below, which could be the surface temperature of the Sun?

• 4,200 K

• 5,800 K

• 8,900 K

• 14.300 K

Tags

NGSS.HS-ESS1-1

Which of the following elements is/are represented in the spectrum below?

• Hydrogen Only

• Helium Only

• Hydrogen and Helium

• Calcium Only

Tags

NGSS.MS-PS1-2

The spectrum of a distant star contains sodium lines that are offset from their normal position, as shown. What is the most likely explanation?

• The star is relatively hot.

• The star is relatively cool.

• The star is moving rapidly toward us.

• The star is moving rapidly away from us.

Tags

NGSS.HS-ESS1-2

In the 1920s, Edwin Hubble looked at the spectra of stars from distant galaxies. To his surprise, he found that all of these spectra were red-shifted, and that the more distant the galaxy, the greater the red-shift. What is a reasonable conclusion from this evidence?

• The universe is expanding.

• The universe is contracting.

• The universe is unchanging.

• The universe is curved.

Tags

NGSS.HS-ESS1-2

Which element is not represented in the star spectrum below?

• Hydrogen

• Helium

• Calcium

• Magnesium

Tags

NGSS.MS-PS1-1