Radioactive Decay: The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days. If the initial decay rate of the sample is 6.2 × 1017 Bq, what is the decay rate after 37 days?
Fill in the blank(s) with the appropriate word(s).
2.2 × 1017 Bq
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Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
A. four times faster than the hydrogen molecules.
B. at 1/4 the speed of the hydrogen molecules.
C. sixteen times faster than the hydrogen molecules.
D. at 1/16 the speed of the hydrogen molecules.
E. at 1/
the speed of the hydrogen molecules.
An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second?
A) 25 m B) 15 m C) 5.0 m D) 45 m
The most common rocks in Earth's crust are
a. sedimentary. b. metamorphic. c. igneous. d. lava.
When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 W b. 7.6 W c. 6.9 W d. 8.0 W e. 2.8 W