Concept explainers
The way the universe would have been different if the half-life of
Answer to Problem 16Q
If the half- life of
Explanation of Solution
Given:
The half- life of
Formula used:
The half- life equation,
Calculation:
Analyzing the two situations where the half-life of
For zero half- life,
This means
If
For
The final amount of particles is the same as the initial amount. The result implies that
Most of the elements having a similar number of protons and neutrons are stable especially if the number of protons is even.
An
In a core of a star with enough pressure and mass, two
On the other hand, if
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Chapter 19 Solutions
Universe: Stars And Galaxies
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- Suppose you are designing a proton decay experiment and you can detect 50 percent of the proton decays in a tank of water. (a) How many kilograms of water would you need to see one decay per month, assuming a lifetime of 1031 y ? (b) How many cubic meters of water is this? (c) If the actual lifetime is 1033 y , how long would you have to wait on an average to see a single proton decay?arrow_forwardSuppose that the universe were full of spherical objects, each of mass m and radius r . If the objects were distributed uniformly throughout the universe, what number density (#/m3) of spherical objects would be required to make the density equal to the critical density of our Universe? Values: m = 4 kg r = 0.0407 m Answer must be in scientific notation and include zero decimal places (1 sig fig --- e.g., 1234 should be written as 1*10^3)arrow_forwardIn a cyclotron facility, 106 atoms of F-18 were created. The half-life of F-18 is 110 minutes. After the target has sat and decayed for 220 minutes, how many F-18 atoms are left? 3.0 x 105 atoms 1.5 x 105 atoms 2.5 x 105 atoms 2.0 x 105 atomsarrow_forward
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