Absorption Spectra

A scientist has a sample of an unknown gas. In order to identify it, they shine a continuous spectrum of white light through the gas and observes which wavelengths of light are absorbed by it. This is shown in the figure, as well as the absorption spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?

• xenon

• oxygen

• helium

• neon

• argon

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

An astronomer looks at the spectrum of light from a distant star. Between Earth and the star is a large cloud of dust and gas. The star emits continuous-spectrum white light, but some of the light is absorbed by the cloud. The figure shows the spectrum of light that the astronomer observes as well as the absorption spectra of several pure elements. Which of the five elements shown does the interstellar cloud contain?

• hydrogen and helium

• hydrogen and oxygen

• hydrogen, helium, and nitrogen

• oxygen and nitrogen

Tags

NGSS.HS-PS4-3

An astronomer looks at the spectrum of light from a distant star. The spectrum they see is shown in the figure. They compare the emission lines within the spectrum to the emission lines in the spectra of pure elements, which are also shown in the figure, in order to identify which elements are present in the outer layers of the star. State all of the elements that are present in the outer layers of the star.

• hydrogen, helium, and carbon

• hydrogen, helium, and boron

• helium, oxygen , and carbon

• hydrogen, helium, boron, and carbon

Tags

NGSS.HS-ESS1-3

The absorption lines in the spectrum for Galaxy A are shifted toward the _____ end of the spectrum when compared to the lines for the Milky Way.

• red

• blue

Tags

NGSS.HS-ESS1-2

The absorption spectrum of a star is shown at the top of the image. When compared with the spectra of the pure gases below, which elements are present in the star?

• hydrogen

• helium

• sodium

• lithium

Tags

NGSS.HS-PS4-3

The absorption lines in the spectrum for Galaxy B are shifted toward the _____ end of the spectrum when compared to the lines for the Milky Way.

• red

• blue

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-4

Which class of star has the highest temperature?

• O

• M

• A

• G

Tags

NGSS.HS-ESS1-3

In the context of the Bohr model, what is an absorption spectrum?

• A spectrum of light emitted by an atom

• A spectrum of light absorbed by an atom

• A spectrum of sound waves

• A spectrum of magnetic fields

Tags

NGSS.HS-PS4-3

What is the significance of the Rydberg constant in the Bohr model?

• It determines the speed of light

• It is used to calculate atomic mass

• It is used to predict the wavelengths of spectral lines

• It measures the strength of chemical bonds

Tags

NGSS.HS-PS4-3

Which of the following is true about absorption spectra?

• They are continuous

• They have dark lines

• They are identical to emission spectra

• They are not related to energy levels

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4