Exam 23: Light,astronomical Observations,and the Sun

Dark-line (absorption)spectra can be used to identify the elements present in stars.

Light can be described as a stream of fast-moving particles called ________.

What is the ideal way,if cost is no object,for a telescope to avoid atmospheric disturbance?

When excited electrons decay to ground state,hydrogen emits along distinctive line near the visible red.An astronomer observes what appear to be hydrogen emission lines from a distant star but they are in the infrared spectral band.She concludes ________.

What fuel is the source of energy from the Sun?

Because lenses act like a prism to separate the colors of the spectrum,they produce a troublesome effect known as ________.

The outermost layer of the Sun is called the ________.

Streams of protons and electrons emitted from the Sun produce ________.

If solar flares pose a danger to orbiting spacecraft and astronauts,how much warning is there for the danger?

The study of spectroscopy was begun by ________.

Nearly all large optical telescopes built today are ________.

Sir Isaac Newton built and used reflecting telescopes.

In a radio telescope,the electromagnetic energy is gathered by ________.

Streams of protons and electrons emitted from the Sun are known as the ________.

Describe the concept of "red shift" and how this observation relates to theories that the universe is expanding.

The wavelength of light emitted from a distance object is related to ________.

Radio telescopes are able to detect very short wave radiation emitted by celestial objects.

Astronomers currently estimate the internal temperature of the Sun at 1500°C.

Which of the following is not considered a form of electromagnetic radiation?

If you live at high latitude,when do you expect to see the aurora?