The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years
Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?
A) The activities will be equal.
B) The activity of the cobalt-60 sample will be greater.
C) The activity of the strontium-90 sample will be greater.
D) The activities cannot be compared without more information.
B
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The Northern and Southern hemispheres have equal illumination from the Sun
A) on the June and December solstices. B) on the March and September equinoxes. C) on all four of the equinoxes and solstices. D) only on the March equinox. E) at all times.
A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
A) 1400 million years B) 2100 million years C) 700 million years D) 350 million years
The maximum theoretical thermodynamic efficiency of a heat engine operating between hot and cold reservoirs is a function of which of the following?
a. hot reservoir temperature only b. cold reservoir temperature only c. both hot and cold reservoir temperatures d. None of the above choices are valid.
The bending of light because of a speed change as it moves from one medium to another is called
a. diffraction. b. refraction. c. reflection. d. the Doppler effect.