Hydrogen, both in neutral and in molecular form, can be used to map out features of the Galaxy through its emission of 21-cm radiation.
Answer the following statement true (T) or false (F)
False
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The buoyant force on an object is:
a. the same for all floating objects. b. equal to a constant that depends on the fluid times the weight of fluid that the object displaces. c. inversely proportional to the weight of fluid displaced by the floating object. d. equal to the weight of fluid that the object displaces. e. a fictitious force.
What do astronomers mean by light pollution?
A) Light pollution refers to pollution caused by light industry as opposed to heavy industry. B) Light pollution refers to harmful gases emitted by common street lights. C) Light pollution refers to light used for human activities that brightens the sky and hinders astronomical observations. D) Light pollution refers to the lights that must be used inside major observatories and that make it difficult for astronomers' eyes to adapt to darkness. E) Light pollution is another name for sunlight, which makes it impossible to see stars in the daytime.
Exclusion Principle: Which one of the following is the correct electronic configuration for the sodium atom, which has 11 electrons?
A. 1s1 2s2 3p6 2s2 B. 1s2 2s1 3p6 2s2 C. 1s1 2s2 2p6 2s2 D. 1s2 2s2 2p6 3s2 E. 1s2 2s2 2p6 3s1
If the frequency of blinks for a light source appears to double as the light source approaches you, the frequency of blinks as it moves away from you at the same speed
A) is halved. B) is doubled. C) stays the same.