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
Question 2
Wave frequency is inversely proportional to
a. amplitude.
b. period.
c. wave velocity.
d. all of these.
Question 3
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)
Question 4
The flat, distorted maps of the world are ______________.
Fill in the blank(s) with correct word
Question 5
Which of the following characterize(s) a wave?
a. Wavelength
b. Amplitude
c. Period
d. All of these
Question 6
Homer says that we can safely use nuclear power because all radioactive nuclei are gone after two half-lives. Marge says that only the decay rate is zero after two half-lives. Which one, if either, is correct, and why?
a. Homer, because half of the nuclei disintegrate in each half-life.
b. Marge, because the number of decays per unit time is halved in each half-life.
c. Homer, because it's safe to handle radioactive substances after two half-lives.
d. Both, because when all nuclei disintegrate the decay rate is also zero.
e. Neither, because one quarter of the nuclei are left after two half-lives.
Question 7
The International Date Line is a theoretical line following approximately the ______________ meridian.
Fill in the blank(s) with correct word
Question 8
A quantity of ideal gas in a rigid container has a pressure of 1.00 106 Pa at 0C. If the pressure is increased to 1.75 106 Pa, what is the temperature of the gas after this is done?
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