What fraction of the initial amount of an isotope
It has been stated that ten half-lives are sufficient for a radioactive isotope sample to decay to backround levels. What fraction of the initial amount of an isotope actually does remain after ten half-lives?
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A singly charged ion of unknown mass moves in a circle of radius 12.5 cm in a magnetic field of 1.2T. The ion was accelerated through a potential difference of 7.0 kV before it entered the magnetic field. What is the mass of the ion?
Suppose there is a room background of 21 counts per minute. If you count the signal and background rate for 10 minutes each, what is the percent error of the net counting rate?
Their molar entropies are in teh sequence H2O <Hg< Br2.Using molecular properties, explain why bromine is more disordered than mercury but water is the most highly order of these thress.
A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.169 rad/s2.
(a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take the motor to make one revolution?
By how many kilograms does the mass of the nuclear fuel decrease in one year? (Assume an efficiency of 35 percent for a nuclear power plant.)
Determine the maximum shear stress developed in the shaft. The shaft has an outer diameter of 80 mm, and the thickness of the wall of the hollow segment is 10 mm.
The nine brand B cars that were tested averaged 32.1 mpg, and the standard deviation was 4.3 mpg. At =0.01, should it conclude that brand A cars have lower average gas mileage than do brand B cars?
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