The elements that we are all made of are common everywhere in the observable Universe
a. True
b. False
Indicate whether the statement is true or false
True
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Radioactive Decay: 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.
To become a negative ion, an atom must
A) lose an electron. B) gain an electron. C) lose a proton. D) gain a proton.
What is the maximum number of electrons that can occupy a 3d subshell?
a. 5 b. 14 c. 10 d. 18
Shock waves occur when
A) the wave source is traveling at a speed greater than the wave speed. B) the frequency of the waves is the resonant frequency of the system. C) the amplitude of waves exceeds the critical shock value. D) the period of the waves matches the lifetime of the waves. E) two waves from different sources collide with each other.