Question 1

Define atomic mass number.

Accepted Answer

Atomic mass number i

Question 2

World Observatories: In order to carry out new observations, modern astronomy requires access to highly specialized telescopes and instruments, be it telescopes in space such as the HST, or large collections of linked radio telescopes like the VLA. These facilities are so expensive to construct and maintain that we are entering an age in which only a single facility for each type of instrument will exist to serve the entire world. What do you think the impact of having only "world observatories" will be on the science of astronomy? Will it influence the scientific process? Should taxpayers be more willing to fund sciences like astronomy in order to avoid this situation?

Accepted Answer

The impact of having only "world observa

Question 3

Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?

Accepted Answer

A) The atomic number is 118, and the atomic mass number is 79. 
B) The atomic number is 79, and the atomic mass number is 197. 
C) The atomic number is 79, and the atomic mass number is 118. 
D) The atomic number is 118, and the atomic mass number is 197. 
A) The atomic number is 118, and the atomic mass number is 79. 
B) The atomic number is 79, and the atomic mass number is 197. 
C) The atomic number is 79, and the atomic mass number is 118. 
D) The atomic number is 118, and the atomic mass number is 197.

Question 4

The spectra of most galaxies show redshifts. This means that their spectral lines .

Accepted Answer

A) have wavelengths that are shorter than normal 
B) have a higher intensity in the red part of the spectrum 
C) always are in the red part of the visible spectrum 
D) have wavelengths that are longer than normal 
A) have wavelengths that are shorter than normal 
B) have a higher intensity in the red part of the spectrum 
C) always are in the red part of the visible spectrum 
D) have wavelengths that are longer than normal

Question 5

You are currently emitting electromagnetic waves.

Accepted Answer

A) True 
 B)False

Question 6

According to the laws of thermal radiation, hotter objects emit photons with _ _.

Accepted Answer

A) a higher average speed 
B) a lower average frequency 
C) a shorter average wavelength 
D) a lower average energy 
A) a higher average speed 
B) a lower average frequency 
C) a shorter average wavelength 
D) a lower average energy

Question 7

Compare the energy and speed of infrared and visible light. Which of the following statements is true?

Accepted Answer

A) Infrared light has higher energy, and moves faster. 
B) Infrared light has higher energy, but the same speed. 
C) Visible light has higher energy, and moves faster. 
D) Visible light has higher energy, but the same speed. 
A) Infrared light has higher energy, and moves faster. 
B) Infrared light has higher energy, but the same speed. 
C) Visible light has higher energy, and moves faster. 
D) Visible light has higher energy, but the same speed.

Question 8

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?

Accepted Answer

A) 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. 
B) The only way to decide is to make a graph of the intensity of the light at every wavelength, and then analyze the graph carefully. 
C) An emission line spectrum consists of a long bright line, while an absorption line spectrum consists of a long dark line. 
D) The emission line spectrum is produced by electrons jumping up in energy level, while the absorption line spectrum is produced by electrons jumping down in energy level. 
A) 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. 
B) The only way to decide is to make a graph of the intensity of the light at every wavelength, and then analyze the graph carefully. 
C) An emission line spectrum consists of a long bright line, while an absorption line spectrum consists of a long dark line. 
D) The emission line spectrum is produced by electrons jumping up in energy level, while the absorption line spectrum is produced by electrons jumping down in energy level.

Define atomic mass number.

Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?

The spectra of most galaxies show redshifts. This means that their spectral lines .

You are currently emitting electromagnetic waves.

According to the laws of thermal radiation, hotter objects emit photons with _ _.

Compare the energy and speed of infrared and visible light. Which of the following statements is true?

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?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

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Exam 5: Light: the Cosmic Messenger

Define atomic mass number.

Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?

The spectra of most galaxies show redshifts. This means that their spectral lines .

You are currently emitting electromagnetic waves.

According to the laws of thermal radiation, hotter objects emit photons with _ _.

Compare the energy and speed of infrared and visible light. Which of the following statements is true?

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?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters