In a given period, the element of which group has the highest ionization energy?
a. 2A
b. 8A
c. 7A
d. 1A
b
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Why are methods to determine the distances to galaxies termed the "distance ladder"? Explain the term with examples
What will be an ideal response?
Sound waves in the interstellar medium
A) cannot exist at all. B) travel so slowly that they are undetectable. C) cannot be heard by human ears, but do indeed travel through the gas. D) travel extremely quickly and are therefore very loud.
When Nellie Newton hangs at rest in the middle of a clothesline, the tension will not be the same in each side of the rope when
A) the lengths of rope on each side are different. B) the angles at each side of the rope are unequal. C) she is in equilibrium. D) none of the above
What is the hole in the ozone layer thought to be caused by?
A) greenhouse gases B) carbon dioxide C) water vapor D) CFCs E) acid rain