Why do you think you were asked to complete more cycles in Procedure 1, Step 3, if the total time was less than 10 seconds for 10 cycles?
More cycles were completed to increase the accuracy of the data.
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How can a half-life be used to tell the age of a sample?
A) The half-life of an isotope is constant. B) The amount of radioactive form depends on the amount of radiation in the surroundings. C) The ratio between the radioactive form and the stable form depends on the archaeological record. D) The ratio between the radioactive form and stable form varies regularly with time. E) both C and D
Which of the following statements best describes the concept of entropy?
A) Energy has a tendency to disperse. B) Energy is neither created nor destroyed. C) The entropy of the universe is constantly decreasing. D) The energy released in a chemical reaction is the same as the difference in the energy of the bonds broken and formed. E) Energy has a tendency to remain in one place.
If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is
A) 3 m/s2. B) 6 m/s2. C) 60 m/s2. D) 600 m/s2.
The spectra of the coolest stars contain strong absorption features (or lines) of
a. TiO molecules.
b. ionized helium.
c. helium.
d. hydrogen.
e. All of the other choices are correct.