As a body falls through air starting from rest, its velocity
a. stays constant
b. continuously decreases
c. continuously increases
d. gets larger and larger, eventually reaching a constant value
e. gets smaller and smaller, eventually approaching zero
[Ques. 2] What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect.
b. A rad measures a biological effect and a rem measures an amount of radiation.
c. Rem is an older term for rad.
d. One rem equals 100 rads.
e. One rad equals 100 rems.
[Ques. 3] As a body falls through air starting from rest, its acceleration
a. is zero
b. stays constant
c. continuously decreases
d. continuously increases
e. gets smaller and smaller, eventually approaching zero
[Ques. 4] How do we determine the age of an oil deposit?
a. By measuring the amount of uranium that has not decayed into lead.
b. By measuring its ratio of carbon-14 to carbon-12.
c. By exposing the sample to cosmic rays in the environment to produce carbon-14.
d. By calculating the amount of lead that has decayed from uranium.
e. By calculating the amount of carbon that has decayed into nitrogen.
[Ques. 5] At the highest point on the path of a projectile, its vertical acceleration
a. equals g pointing downwards
b. equals g pointing upwards
c. is zero
d. is undetermined
e. does not exist
[Ques. 6] On page 526 of your textbook, you learned that one gram of radium produces over a million times the radiation as does one gram of uranium. This means that a much larger fraction of radium atoms are undergoing radioactive decay each second than for uranium. How does the half-life of radium compare to the half-life of uranium?
a. The half-life of radium is much smaller than the half-life of uranium.
b. The half-life of radium is the same as the half-life of uranium.
c. The half-life of radium is much larger than the half-life of uranium.
d. The information is insufficient to answer the question.
e. The half-life of the radium is shorter at first, but gets longer as the radium sample is depleted.
[Ques. 7] Where is the sun located relative to a planet's orbit about it?
a. at the center of the orbit, which is a circle
b. at the center of the orbit, which is an ellipse
c. at one focus of the ellipse which forms the orbit
d. none of the above
[Ques. 8] What is the half-life of a radioactive element?
a. Half the amount of time it takes the element to decay.
b. The amount of time in which half the quantity of the element will decay.
c. One-half curie of the element.
d. The inverse of the number of decays per second from a sample, expressed in units of time.
e. Half of the amount of the element needed for decay to proceed.
[Ques. 9] Planetary orbits are
a. parabolas c. circles
b. ellipses d. none of the above.
[Ques. 10] What is a curie?
a. The unit of speed of radioactive decay.
b. The same unit as an alpha particle or a helium nucleus.
c. The half-life of an isotope expressed as a rate instead of a time (i.e., per second instead of seconds).
d. The unit that measures the number of decays in each unit of time that are occurring in a sample.
e. The unit of momentum of a radioactive particle.
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