Nuclei contain
A.) Electrons, protons, and neutrons.
B.) Electrons and protons.
C.) Protons and neutrons.
D.) Protons and electrons.
E.) Neutrons and electrons.
Ans: C.) Protons and neutrons.
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What makes up the interstellar medium?
A) O and B stars B) open clusters C) K and M stars D) gas and dust E) all of the above
Which of the following kinds of stars best obey the mass-luminosity relation?
a. main sequence stars b. giant stars c. supergiant stars d. white dwarfs e. all of the above
Which of the following frequencies could NOT be present as a standing wave in a 2-m-long organ pipe open at both ends? The fundamental frequency is 85 Hz.
A. 85 Hz. B. 170 Hz. C. 255 Hz. D. 340 Hz. E. 382 Hz.
As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about:
A) 12 hours. B) a week. C) two weeks. D) a month. E) 5.5 years.