Quiz 6-3

What does angular resolution measure? a)The number of electromagnetic waves captured by an image b)The angular size of the smallest features that the telescope can see c)The size of an image d)The brightness of an image

b) The angular size of the smallest features that the telescope can see

What is the purpose of adaptive optics? a)It allows ground-based telescopes to observe ultraviolet light that normally does not penetrate the atmosphere b)It reduces the blurring caused by atmospheric turbulence for telescopes on the ground c)it allows several small telescopes to work together like a single larger telescope d)It is a special technology that allows the Hubble to adapt to study many different astronomical objects

b)It reduces the blurring caused by atmospheric turbulence for telescopes on the ground

What is the angular resolution of the human eye? a)About 1 arcuminute, or 1/60 of a degree b) about one degree c) about 1 arcsecond (1/3600 of a degree) d)About 1 millarsecond

a)About 1 arcuminute, or 1/60 of a degree

What is the purpose of interferometry? a)It allows two or more small telescopes to achieve the angular resolution of a much larger telescope b)It reduces the twinkling of stars c)It is designed to prevent light pollution from interfering with astronomical observations d)It allows two or more small telescopes to achieve a larger light-collecting area than they would have independently.

a)It allows two or more small telescopes to achieve the angular resolution of a much larger telescope

Which of the following best describes what we mean by the focal plane if a telescope? a)It is the place where, if we mounted film or an electronic detector, we could get a clear image of an object viewed through the telescope. b)It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view c)It is the lower surface of the telescopes primary lens, or mirror d)It is the upper surface of the telescopes primary lens or mirror.

a)It is the place where, if we mounted film or an electronic detector, we could get a clear image of an object viewed through the telescope.

What do astronomers mean by light pollution? a)Light pollution is light from human sources that make it difficult to see the stars at night b)Is a type of air pollution created by lightweight gases c)A term used to describe the appearance of the sky in regions that are crowded with stars

a)Light pollution is light from human sources that make it difficult to see the stars at night

Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope? a)It is much easier to make a large refracting telescope than a large reflecting telescope b)Reflecting telescopes make much clearer images than can refracting telescopes of the same size c)A refracting telescope uses a transparent glass lens to focus light while a reflecting telescope uses a mirror to focus light d)A refracting telescope produces refracted images while a reflecting telescope produces reflected images

c)A refracting telescope uses a transparent glass lens to focus light while a reflecting telescope uses a mirror to focus light

Which of the following is NOT one of the three main categories of observation generally used by astronomers? a)timing to track how an object's brightness varies with time b)spectroscopy to spread an objects light into a spectrum c)Filtering to look at just a single color from an object d)imaging to get a picture of astronomical objects

c)Filtering to look at just a single color from an object

What is CCD? a)It refers to any kind of instrument that can be hooked up to a telescope b) It is a unit used by astronomers to measure angular resolution c)It is an electronic detector that can be used in place of photographic film for making images. d)It is an abbreviation for the world's largest operating telescope.

c)It is an electronic detector that can be used in place of photographic film for making images.

Which of the following statements best describes the two principle advantages of telescopes over eyes? a) Telescopes can collect far more light with far greater magnification b)Telescopes collect more light and are unaffected by twinkling c)Telescopes can collect far more light with far better angular resolution d)Telescopes have much more magnification and better angular resolution

c)Telescopes can collect far more light with far better angular resolution

Which of the following is caused by atmospheric turbulence? a)Diffraction of light b)Light pollution c)Twinkling of stars d)magnification of images

c)Twinkling of stars

What do we mean by the diffraction limit of a telescope? a)It describes the maximum exposure time for images captured with the telescope b)It is the maximum size to which any telescope can be built c)it describes the farthest distance to which the telescope can see d)It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images

d)It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images

Which of the following wavelength regions can be studied with telescopes on the ground? a)infrared, visible, and ultraviolet light b)All light with wavelengths shorter than infrared wavelengths c) All light with wavelengths longer than infrared wavelengths d)Radio, visible, and very limited portions of the infrared and ultraviolet regions

d)Radio, visible, and very limited portions of the infrared and ultraviolet regions