Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of these two nuclides
If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due A) predominantly to Y.
B) predominantly to X.
C) entirely to Y.
D) to X and Y equally.
A
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a. nuclear fission b. nuclear fusion c. neutron activation d. nuclear emission e. binding energy
When we look at the farthest galaxies in the Hubble Ultra Deep Field we can see their light from:
A.) About 12 or 13 billion years ago. B.) About 4.5 billion years ago. C.) About 1 or 2 billion years ago. D.) About 4 million years ago.
Ammonia, NImage, is more polar than is borane, BImage because it
A) has a lone pair of electrons. B) is less symmetrical than borane. C) its hydrogens are not exactly opposite one another. D) all of the above
During an isothermal process, 5.0 J of thermal energy via the process of heating is removed from an ideal gas. What is the change in internal (thermal) energy of the gas?
A) 0 J B) 2.5 J C) 5.0 J D) 10 J