Author Question: For a period after June 21 for locations above 23 N, sunrise in the conterminous United States ... (Read 73 times)

viki · **on:** Jul 29, 2018

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?

Athena23 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

later

Answer to Question 2

b

Answer to Question 3

7.4 108 Ci

Answer to Question 4

(Mercator) projections

Answer to Question 5

d

Answer to Question 6

e

Answer to Question 7

180

Answer to Question 8

204.75C