Question 1

In addition to its capability of being stored,an ordinary (nondigital) photograph has what major advantage over the unaided human eye for astronomical observations?

Accepted Answer

A)   The photograph is sensitive to 70% of the photons that land on it.
B)   The photograph can easily be enhanced by feeding its pixels electronically into a computer.
C)   The photograph responds to a long exposure time by producing higher resolution.
D)   The photograph can be used in conjunction with a filter to observe only certain colors.

Question 2

The majority of the mass of ordinary matter resides in the:

Accepted Answer

A)   electrons and the nuclei, shared about equally.
B)   electromagnetic energy stored in the atom, from E = mc².
C)   nuclei of atoms.
D)   electron clouds around the nuclei of atoms.

Question 3

Which way does a light ray bend when it crosses the plane,smooth surface of a dense,transparent material (from air or a vacuum) at an angle to the perpendicular?

Accepted Answer

A)   The light ray does not bend at all because the material is transparent.
B)   The light ray bends toward the perpendicular.
C)   The light ray always bends so that it travels perpendicular to the surface.
D)   The light ray bends away from the perpendicular.

Question 4

What is the total number of protons and neutrons in the nucleus of an atom of the fissionable isotope of uranium used in nuclear weapons,²³⁵U,which has an atomic number of 92?

Accepted Answer

A)   235
B)   92
C)   143
D)   327

Question 5

Which of the following techniques has resulted in the BEST angular resolution of the image?

Accepted Answer

A)   adaptive optics as used with Keck II on Mauna Kea
B)   HST, an orbiting telescope
C)   active optics, as used with the New Technology Telescope in Chile
D)   interferometry, as used with the four telescopes of the VLT at the Paranel facility in Chile

Question 6

Gamma rays are generally absorbed in Earth's atmosphere.However,it is possible to build Earth-based observatories that detect secondary effects of gamma rays,such as the blue light produced when the particles they collide with move faster than the speed of light in air.This blue light is called:

Accepted Answer

A)   synchrotron light.
B)   Cherenkov radiation.
C)   ultraviolet light.
D)   superluminal light.

Question 7

Light from each part of the source being observed falls on each part of the primary mirror of a Newtonian telescope not obstructed by the secondary mirror.The important consequence of this is that:

Accepted Answer

A)   the image does not have a dark spot indicating the presence of the secondary mirror.
B)   the image is not darkened (overall)  because of the presence of the secondary mirror.
C)   cheaper spherical mirrors can be used rather than a more costly parabolic mirror.
D)   the secondary mirror can be made as large as needed without influencing the quality of the image.

Question 8

In Bohr's model of the hydrogen atom,light is emitted whenever an electron:

Accepted Answer

A)   jumps from a lower to an upper energy level or orbit.
B)   reverses its direction of motion in its orbit.
C)   jumps from an upper to a lower energy level or orbit.
D)   spirals into the nucleus.

Question 9

The speed of light in space is:

Accepted Answer

A)   infinite, traveling through space instantaneously.
B)   variable, depending on the speed of its source, but very large (on average, 3 × 10⁸ meters per second) .
C)   3 × 10¹⁰ meters per second, independent of the speed of the source.
D)   3 × 10⁸ meters per second, independent of the speed of the source.

Question 10

Visible wavelengths of electromagnetic radiation have a range of wavelengths of:

Accepted Answer

A)   400 nm to 700 nm.
B)   1 nm to 100 nm.
C)   800 nm to 1900 nm.
D)   90 nm to 130 nm.

Question 11

An atom is now known to consist of a:

Accepted Answer

A)   positively charged crystal structure with electrons moving within it.
B)   small, positively charged black hole with electrons held in orbits around it by intense gravitational forces.
C)   uniform distribution of positively charged matter with electrons embedded in it.
D)   small, massive, electrically charged core surrounded by electrons.

Question 12

Spherical aberration occurs in a lens when it is:

Accepted Answer

A)   not spherical enough.
B)   not exactly the same shape on each side.
C)   spherical.
D)   parabolic.

Question 13

The light-gathering power of a telescope depends directly on the:

Accepted Answer

A)   area of the final aperture of its eyepiece.
B)   focal length of its primary mirror or lens.
C)   ratio of the focal lengths of its primary element (mirror or lens)  and its eyepiece.
D)   area of its primary mirror or lens.

Exam 3: Light and Telescopes

An atom is now known to consist of a:

Correct Answer
verified

Light from each part of the source being observed falls on each part of the primary mirror of a Newtonian telescope not obstructed by the secondary mirror.The important consequence of this is that:

Correct Answer
verified

Which way does a light ray bend when it crosses the plane,smooth surface of a dense,transparent material (from air or a vacuum) at an angle to the perpendicular?

Correct Answer
verified

The speed of light in space is:

Correct Answer
verified

Spherical aberration occurs in a lens when it is:

Correct Answer
verified

Visible wavelengths of electromagnetic radiation have a range of wavelengths of:

Correct Answer
verified

In addition to its capability of being stored,an ordinary (nondigital) photograph has what major advantage over the unaided human eye for astronomical observations?

Correct Answer
verified

The majority of the mass of ordinary matter resides in the:

Correct Answer
verified

What is the total number of protons and neutrons in the nucleus of an atom of the fissionable isotope of uranium used in nuclear weapons,²³⁵U,which has an atomic number of 92?

Correct Answer
verified

Gamma rays are generally absorbed in Earth's atmosphere.However,it is possible to build Earth-based observatories that detect secondary effects of gamma rays,such as the blue light produced when the particles they collide with move faster than the speed of light in air.This blue light is called:

Correct Answer
verified

In Bohr's model of the hydrogen atom,light is emitted whenever an electron:

Correct Answer
verified

The light-gathering power of a telescope depends directly on the:

Correct Answer
verified

Which of the following techniques has resulted in the BEST angular resolution of the image?

Correct Answer
verified

Exam 3: Light and Telescopes

An atom is now known to consist of a:

Correct AnswerverifiedShow Answer

Light from each part of the source being observed falls on each part of the primary mirror of a Newtonian telescope not obstructed by the secondary mirror.The important consequence of this is that:

Correct AnswerverifiedShow Answer

Which way does a light ray bend when it crosses the plane,smooth surface of a dense,transparent material (from air or a vacuum) at an angle to the perpendicular?

Correct AnswerverifiedShow Answer

The speed of light in space is:

Correct AnswerverifiedShow Answer

Spherical aberration occurs in a lens when it is:

Correct AnswerverifiedShow Answer

Visible wavelengths of electromagnetic radiation have a range of wavelengths of:

Correct AnswerverifiedShow Answer

In addition to its capability of being stored,an ordinary (nondigital) photograph has what major advantage over the unaided human eye for astronomical observations?

Correct AnswerverifiedShow Answer

The majority of the mass of ordinary matter resides in the:

Correct AnswerverifiedShow Answer

What is the total number of protons and neutrons in the nucleus of an atom of the fissionable isotope of uranium used in nuclear weapons,²³⁵U,which has an atomic number of 92?

Correct AnswerverifiedShow Answer

Gamma rays are generally absorbed in Earth's atmosphere.However,it is possible to build Earth-based observatories that detect secondary effects of gamma rays,such as the blue light produced when the particles they collide with move faster than the speed of light in air.This blue light is called:

Correct AnswerverifiedShow Answer

In Bohr's model of the hydrogen atom,light is emitted whenever an electron:

Correct AnswerverifiedShow Answer

The light-gathering power of a telescope depends directly on the:

Correct AnswerverifiedShow Answer

Which of the following techniques has resulted in the BEST angular resolution of the image?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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