The number of daylight hours at any place on Earth's oceans depends on the ______________ and the ______________ of the year.
Fill in the blank(s) with correct word
[Ques. 2] Wave velocity is inversely proportional to
a. period.
b. wavelength.
c. amplitude.
d. all of these.
[Ques. 3] The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730 y. If an archaeologist working a dig finds an ancient firepit containing some partially consumed firewood and the wood contains only 12.5 percent of the 14C content of an equal carbon sample from a present-day tree, what is the age of the ancient site?
[Ques. 4] For a period after June 21, in Hawaii sunrise occurs ______________ each day.
Fill in the blank(s) with correct word
[Ques. 5] Wave period is the reciprocal of
a. amplitude.
b. frequency.
c. wave velocity.
d. all of these.
[Ques. 6] The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?
[Ques. 7] For a period after June 21 for locations above 23 N, sunrise in the conterminous United States occurs ______________ each day.
Fill in the blank(s) with correct word
[Ques. 8] Wave frequency is inversely proportional to
a. amplitude.
b. period.
c. wave velocity.
d. all of these.
[Ques. 9] A pure sample of 226Ra contains 2.0 1014 atoms of the isotope. If the half-life of 226Ra = 1.6 103 years, what is the decay rate of this sample? (1 Ci = 3.7 1010 decays/s)
[Ques. 10] The flat, distorted maps of the world are ______________.
Fill in the blank(s) with correct word
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