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What is 1 + 3?
Shorter wavelengths correspond to more energetic photons. T or F
How many stars compose the Milky Way galaxy?
approximately 200 billion stars
What is the source of the Sun's energy?
The Sun produces energy by converting ________.
hydrogen nuclei to helium nuclei
nuclear fusion of hydrogen into helium occurs in the ______
Energy moves through the sun's ____ by means of rising of hot gas and falling of cooler gas
nearly all the visible light we see from the sun is emitted from the __/
most of the sun's ultraviolet light is emitted from the narrow layer called the ___ where temperatures increases with altitude.
we can see the sun's __ most easily during total solar eclipses
the ___ is the layer of the sun between its core and convection zone.
The outermost layer of the Sun is called the ________.
A continuous spectrum is produced by a ___.
hot, high-density light source
An emission spectrum is produced by a ___.
hot, low-density light source.
The Sun's surface has a grainy texture produced by numerous bright markings called ________.
How does the Doppler effect explain differences in sound pitch?
-The approaching sound wave has a higher pitch than the sound wave moving away.
-The approaching sound wave has a shorter apparent wavelength than the sound wave moving away.
Light can be described as a stream of fast-moving particles called ________.
To determine whether a celestial body is approaching or receding from Earth, astronomers employ ________.
the Doppler principle
How long ago did the Big Bang occur?
13.7 billion years
The layer of the solar atmosphere directly above the photosphere is referred to as the ________.
The spectra of most stars are of this type.
dark-line (absorption) spectrum
What are the four major layers of the Sun?
the interior, the surface, the chromosphere, and the corona
The ________ explains how our solar system probably formed from a giant cloud of gases and dispersed solid particles.
Which of the following types of electromagnetic radiation has the shortest wavelength?