11)For the next two questions, consider the burning of helium in a star. After a
ID: 288265 • Letter: 1
Question
11)For the next two questions, consider the burning of helium in a star. After a star burns hydrogen, making helium for most of its life, it will usually burn helium. Burning helium is done using the “triple-alpha process.” This converts three helium atoms into what type of atom? A) Nitrogen B) Hydrogen C) Beryllium D) Oxygen E) Carbon 12)Some of that new kind of atom is then combined with another helium atom to make what other kind of atom? A) Oxygen B) Carbon C) Beryllium D) Nitrogen E) Hydrogen 13)An effort was begun in the 1800’s to classify stars by the way their light appears when spread out into a “spectrum” of colors (like a rainbow). Astronomers used the letters of the alphabet (A, B, C, ...) to rate the spectra of the stars based on the strength of the lines in the spectra. Specifically, they rated the stars alphabetically by the strength of spectral lines caused by what type of atom? A) Carbon B) Oxygen C) Helium D) nitrogen E) Hydrogen F) ion G) silicon 14)Later, Annie Jump Cannon (1863-1941) and others led an effort at Harvard Observatory to reorganize and standardize the above “spectral types” of stars. What properties of stars gradually become different as the stars go from letter O to letter M in the sequence O, B, A, F, G, K, M? A) Volume and mass B) velocity and momentum C) temperature and color D) distance and brightness 15)After that, each of those letters was divided into ten smaller classifications. How does a B7 star compare to a B6 star? It is ______? A)Hotter B) lower mass C) higher mass D) older E) cooler F) younger G) dimmer H) brighter
Explanation / Answer
11) Option E is correct.
The tri-alpha process is fusion of helium and carbon.
12) Option A is correct.
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