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?
The proportion of obese and extremely obese adults in the United States has increased over the past
Dolores Huerta and Cesar Chavez, leaders of the United Farm Workers, discuss their 1968 strike of ...
One of the cultural privileges of being white in the United States is less suspicion of wrongdoing.
Continental United States Hurricane Strikes from 1950-2011
The locations of disease-causing mutations in the cystic fibrosis gene
Survivorship curves for people in the United States in the early 20th and early 21st centuries