Astronomy 105 Chapter 5 HW

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

Which forms of light are lower in energy and frequency than the light that our eyes can see?

When considering light as made up of individual pieces, each characterized by a particular amount of energy, the pieces are called _________.

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?

Suppose you know the frequency of a photon, and the speed of light. What else about the photon can you determine?

Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?

Consider an atom of carbon in which the nucleus contains six protons and seven neutrons. What is its atomic number and atomic mass number?

If we say that a material is opaque to ultraviolet light, we mean that it _________.

Visible light from a distant star can be spread into a spectrum by using a glass prism or ______.

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?

An atom that has fewer electrons than protons is called a/an _________.

Thermal radiation is defined as _________.

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

Suppose you want to know the chemical composition of a distant star. Which piece of information is most useful to you?

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

What is the angular resolution of the human eye?

Which of the following statements best describes the two principle advantages of telescopes over eyes?

What do astronomers mean by light pollution?

The stars in our sky twinkle in brightness and color because of _________.

What is the purpose of adaptive optics?

What is the purpose of interferometry?

We divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to right in order of increasing wavelength. To rank items as equivalent, overlap them.

Rank the forms of light from left to right in order of increasing frequency. To rank items as equivalent, overlap them.

Rank the forms of light from left to right in order of increasing speed. To rank items as equivalent, overlap them.