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Astronomy 105 Chapter 5 Hw Quiz
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Multiple Choice Questions
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From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
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Gamma rays, X rays, ultraviolet, visible light, infrared, radio
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gamma raysx raysultravioletvisible lightinfraredradio waves
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radio wavesinfraredvisible lightultravioletx raysgamma rays
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They have different numbers of protons in their nucleus.
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
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They have different numbers of protons in their nucleus.
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Telescopes can collect far more light with far better angular resolution.
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They have a frequency of 2 hertz.
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The wavelengths of spectral lines in the star's spectrum
Suppose you know the frequency of a photon, and the speed of light. What else about the photon can you determine?
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have wavelengths that are longer than normal
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Its wavelength and energy.
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They have a frequency of 2 hertz.
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The wavelengths of spectral lines in the star's spectrum
The stars in our sky twinkle in brightness and color because of _________.
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absorbs ultraviolet light
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a shorter average wavelength
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have wavelengths that are longer than normal
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turbulence in the Earth's atmosphere
Which forms of light are lower in energy and frequency than the light that our eyes can see?
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a shorter average wavelength
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items are equivalent
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Infrared and radio
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a diffraction grating.
If we say that a material is opaque to ultraviolet light, we mean that it _________.
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a diffraction grating.
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a shorter average wavelength
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absorbs ultraviolet light
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Infrared and radio
Visible light from a distant star can be spread into a spectrum by using a glass prism or ______.
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a shorter average wavelength
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absorbs ultraviolet light
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a diffraction grating.
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Infrared and radio
Rank the forms of light from left to right in order of increasing frequency. To rank items as equivalent, overlap them.
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Gamma rays, X rays, ultraviolet, visible light, infrared, radio
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items are equivalent
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They have different numbers of protons in their nucleus.
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radio wavesinfraredvisible lightultravioletx raysgamma rays
Suppose you look at a spectrum of visible light by looking through a prism or diffraction grating. How can you decide whether it is an emission line spectrum or an absorption line spectrum?
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The wavelengths of spectral lines in the star's spectrum
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An emission line spectrum consists of bright lines on a dark background, while an absorption line spectrum consists of dark lines on a rainbow background.
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Its wavelength and energy.
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They have a frequency of 2 hertz.
Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?
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They have different numbers of protons in their nucleus.
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Its wavelength and energy.
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The wavelengths of spectral lines in the star's spectrum
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They have a frequency of 2 hertz.
An atom that has fewer electrons than protons is called a/an _________.
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turbulence in the Earth's atmosphere
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photons
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ion
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absorbs ultraviolet light
What do astronomers mean by light pollution?
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Light pollution refers to lights from human sources that make it difficult to see the stars at night.
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It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
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It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
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Telescopes can collect far more light with far better angular resolution.
What is the purpose of adaptive optics?
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Telescopes can collect far more light with far better angular resolution.
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Light pollution refers to lights from human sources that make it difficult to see the stars at night.
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It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
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It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
What is the angular resolution of the human eye?
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It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
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About 1 arcminute, or 1/60 of a degree
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It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
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radiation with a spectrum whose shape depends only on the temperature of the emitting objec
According to the laws of thermal radiation, hotter objects emit photons with _________.
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Infrared and radio
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absorbs ultraviolet light
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a diffraction grating.
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a shorter average wavelength
Suppose you want to know the chemical composition of a distant star. Which piece of information is most useful to you?
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The wavelengths of spectral lines in the star's spectrum
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have wavelengths that are longer than normal
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Its wavelength and energy.
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They have a frequency of 2 hertz.
What is the purpose of interferometry?
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It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
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It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
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Telescopes can collect far more light with far better angular resolution.
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Light pollution refers to lights from human sources that make it difficult to see the stars at night.
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