The heavier elements on Earth (those with atomic numbers greater than 5):

were in existence at the moment of the big bang.

were formed immediately after the big bang.

are formed by stellar nucleosynthesis during the life cycles of existing stars.

are constantly being created by fusion in our Sun and blown here by the solar wind.

All of the above are true statements.


are formed by stellar nucleosynthesis during the life cycles of existing stars.

Physics & Space Science

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The three lowest resonate frequencies of a system are 50 Hz, 150 Hz, and 250 Hz. The system could be

A. a tube of air closed at both ends. B. a tube of air open at one end. C. a tube of air open at both ends. D. a vibrating string with fixed ends.

Physics & Space Science

The Balmer Beta absorption line is a result of a transition of an electron in a hydrogen atom from:

A) level 2 to level 3. B) level 2 to level 4. C) level 3 to level 2. D) level 4 to level 2. E) None of the above.

Physics & Space Science

Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?

A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.

Physics & Space Science

Which statement about this cluster is not true?

A) It contains some stars that are burning helium in their cores. B) It probably contains no young stars at all. C) It is likely to be located in the halo of the galaxy. D) It is likely to be spherical in shape. E) It is the type of cluster known as an open cluster of stars.

Physics & Space Science