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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?

nuclear fusion

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

convection zone

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.

radiation 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.

nebular hypothesis

Which of the following types of electromagnetic radiation has the shortest wavelength?

gamma rays

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