radio wavesinfraredvisible lightultravioletx raysgamma rays
0%
They have different numbers of protons in their nucleus.
Q.2.
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
0%
They have different numbers of protons in their nucleus.
0%
Telescopes can collect far more light with far better angular resolution.
0%
They have a frequency of 2 hertz.
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The wavelengths of spectral lines in the star's spectrum
Q.3.
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
0%
Its wavelength and energy.
0%
They have a frequency of 2 hertz.
0%
The wavelengths of spectral lines in the star's spectrum
Q.4.
The stars in our sky twinkle in brightness and color because of _________.
0%
absorbs ultraviolet light
0%
a shorter average wavelength
0%
have wavelengths that are longer than normal
0%
turbulence in the Earth's atmosphere
Q.5.
Which forms of light are lower in energy and frequency than the light that our eyes can see?
0%
a shorter average wavelength
0%
items are equivalent
0%
Infrared and radio
0%
a diffraction grating.
Q.6.
If we say that a material is opaque to ultraviolet light, we mean that it _________.
0%
a diffraction grating.
0%
a shorter average wavelength
0%
absorbs ultraviolet light
0%
Infrared and radio
Q.7.
Visible light from a distant star can be spread into a spectrum by using a glass prism or ______.
0%
a shorter average wavelength
0%
absorbs ultraviolet light
0%
a diffraction grating.
0%
Infrared and radio
Q.8.
Rank the forms of light from left to right in order of increasing frequency. To rank items as equivalent, overlap them.
0%
Gamma rays, X rays, ultraviolet, visible light, infrared, radio
0%
items are equivalent
0%
They have different numbers of protons in their nucleus.
0%
radio wavesinfraredvisible lightultravioletx raysgamma rays
Q.9.
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?
0%
The wavelengths of spectral lines in the star's spectrum
0%
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.
0%
Its wavelength and energy.
0%
They have a frequency of 2 hertz.
Q.10.
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?
0%
They have different numbers of protons in their nucleus.
0%
Its wavelength and energy.
0%
The wavelengths of spectral lines in the star's spectrum
0%
They have a frequency of 2 hertz.
Q.11.
An atom that has fewer electrons than protons is called a/an _________.
0%
turbulence in the Earth's atmosphere
0%
photons
0%
ion
0%
absorbs ultraviolet light
Q.12.
What do astronomers mean by light pollution?
0%
Light pollution refers to lights from human sources that make it difficult to see the stars at night.
0%
It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
0%
It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
0%
Telescopes can collect far more light with far better angular resolution.
Q.13.
What is the purpose of adaptive optics?
0%
Telescopes can collect far more light with far better angular resolution.
0%
Light pollution refers to lights from human sources that make it difficult to see the stars at night.
0%
It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
0%
It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
Q.14.
What is the angular resolution of the human eye?
0%
It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
0%
About 1 arcminute, or 1/60 of a degree
0%
It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
0%
radiation with a spectrum whose shape depends only on the temperature of the emitting objec
Q.15.
According to the laws of thermal radiation, hotter objects emit photons with _________.
0%
Infrared and radio
0%
absorbs ultraviolet light
0%
a diffraction grating.
0%
a shorter average wavelength
Q.16.
Suppose you want to know the chemical composition of a distant star. Which piece of information is most useful to you?
0%
The wavelengths of spectral lines in the star's spectrum
0%
have wavelengths that are longer than normal
0%
Its wavelength and energy.
0%
They have a frequency of 2 hertz.
Q.17.
What is the purpose of interferometry?
0%
It reduces blurring caused by atmospheric turbulence for telescopes on the ground.
0%
It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
0%
Telescopes can collect far more light with far better angular resolution.
0%
Light pollution refers to lights from human sources that make it difficult to see the stars at night.
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