Astronomy Chapter 5 Multiple Choice – Flashcards

If you have a 100-watt light bulb, how much energy does it use each minute?

If a material is highly opaque, then it

When light reflects off an object, what is the relation between the angle of incidence and the angle of reflection?

If a material is transparent, then it

Grass (that is healthy) looks green because

Everything looks red through a red filter because

Which of the following cannot be described by a field?

The frequency of a wave is

The wavelength of a wave is

How are wavelength, frequency, and energy related for photons of light?

From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?

From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?

Which of the following statements about X rays and radio waves is not true?

Which of the following statements about X rays and radio waves is not true?

We can see each other in the classroom right now because we

Without telescopes or other aid, we can look up and see the Moon in the night sky because it

How many atoms fit across the period at the end of this sentence?

What is a compound?

Compared to the volume of its nucleus, the volume of an atom is about

How much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have?

Which of the following statements about electrical charge is true?

Which of the following statements about electrons is not true?

Suppose you built a scale-model atom in which the nucleus was the size of a tennis ball. About how far would the cloud of electrons extend?

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

Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. If it is doubly ionized, what is the charge of the gold ion and how many electrons remain in the ion?

Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms isotopes of each other?

An atom of the element iron has an atomic number of 26 and an atomic weight of 56. If it is neutral, how many protons, neutrons, and electrons does it have?

Oxygen has atomic number 8. How many times must an oxygen atom be ionized to create an O+5 ion, and how many electrons will the ion have?

At extremely high temperatures (e.g., millions of degrees), which of the following best describes the phase of matter?

Sublimation is the process in which

Dissociation is the process in which

When an atom loses an electron, it becomes

An atom in an excited state contains more of what type of energy than the same atom in the ground state?

When an atom absorbs a photon containing energy, any of the following can happen except which?

The loss of an electron from a neutral helium atom results in

An electron-volt is

The study of energy levels in atoms is called

How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?

If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces

When an electron in an atom goes from a higher energy state to a lower energy state, the atom

When white light passes through a cool cloud of gas, we see

Spectra from neutral atoms compared with spectra from ionized atoms of the same element

Which of the following objects is not a close approximation of a thermal emitter?

Thermal radiation is defined as

A perfectly opaque object that absorbs all radiation and reemits the absorbed energy as thermal radiation is

Which of the following statements about thermal radiation is always true?

Which of the following statements about thermal radiation is always true?

If two objects are the same size but one object is 3 times hotter than the other object, the hotter object emits

A gas heated to millions of degrees would emit

We can learn a lot about the properties of a star by studying its spectrum. All of the following statements are true except one. Which one?

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

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm. What can we conclude?

From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?

How does the spectrum of a molecule differ from the spectrum of an atom?

You observe a distant galaxy. You find that a spectral line normally found in the visible part of the spectrum is shifted toward the infrared. What do you conclude?

If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?

f we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?

Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)

You observe the same spectral line in two stars that are identical in every way except that one rotates faster than the other. How does the spectral line differ between the two?