WorksheetsNuclear Fusion & Emission Spectra
Total questions: 13
Worksheet time: 25mins
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
A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?
helium
neon
xenon
oxygen
argon
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
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
Which class of star has the highest temperature?
O
M
A
G
Which class of star has the lowest temperature?
O
M
A
G
According to the emission spectra, the surface temperature of the star Vega is ____ that of the Sun.
higher than
lower than
equal to
Define nuclear fusion.
combining lighter atoms to make heavier ones
splitting lighter atoms to make heavier ones
combining heavier atoms to make lighter ones
splitting heavier atoms to make lighter ones
When hydrogen is "fused" together in the Sun, what new element is created?
Helium
Carbon Dioxide
Oxygen
Light
Where does nuclear fusion occur in the sun?
Surface
Corona
Core
Convective zone
When stars are in the main sequence, fusing hydrogen into helium, and are neither expanding nor contracting, they are said to be...
dying
in hydrostatic equilibrium
white dwarfs
red hypergiants
How will this star change based on the interaction of the gravitational forces (black arrows) and the internal nuclear forces (grey arrows)?
It is in equilibrium and will not change
The gravitational forces are greater therefore the star's size will get smaller
The gravitational forces are greater therefore the star's size will get larger
The nuclear forces are greater therefore the star's size will get smaller
The nuclear forces are greater therefore the star's size will get larger
