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Radioactive isotopes decay according to a first order process. If N(t) is the number of atoms of a radioactive isotope at time t, then N(t)=N(0)e^(-kt).
A. cu-64 (1/2 = 12.8 hr) is used in brain scans for tumors and in studies of Wilson/s disease, a genertic inability to metabolize copper. how many days are requird before the dose of cu-64 administered to a patient drops to 0.10% of its initial activity? (Cu isnt leaving the body by any process other than its normal radioactive decay.)
B. U-238 decays to Pb-206 with a half life of 4.51*10^9 years, A sample of ocean sediment contains 1.50 mg of U-238 and 0.460 mg of Pb-206. estimate the age of the sediment. (assume that Pb-206 is formed only as a resultant of the decay of U-238; you may also assume that Pb-206 is stable and does not itself decay.)
Discuss how big is a physical protocol data unit and determine the number of simultaneous transmissions for many network architectures.
A sailboat is heading directly north at a speed of 18 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. what is the magnitude of the knots
two charges q1 and q2 have a total charge of 16 c. when they are separated by 1.5 m the force exerted by one charge on
The mass of Mercury is 0.0550 times that of earth, and its radius is 0.380 times that of earth. Calculate the average density of Mercury
Consider a spring of stiffness k and mass m. If we stretch - simultaneously - both ends of the spring by force F1 and F2. What will be the elongation of the spring
A current of 2.0 A is flowing along the z-axis in the positive z direction from the origin to z=-2 m. Find the magnetic field, Which field is the strongest and Why
A centripetal force of 235 N is experienced by a mass of 12.3 g as it is spun in a circular path with a radius of 2.50 meters. What is the period of the object
A ball has a diameter of 3.9 cm and average density of 0.0839 g/cm3. What force is required to hold it completely submerged under water
A long solenoid has a length of 0.72 m and contains 1395 turns of wire. find the magnitude of the magnetic field within the solenoid
the density of helium gas at T=0 degrees Celcius is 0.179kg/m3. Temp is raised to 100 degrees Celcius, but pressure isconstant. calculate new density of gas
The gauge pressure at the bottom of a reservoir is 5.0 times what it is at a depth of 1.8 m. How deep is the reservoir
A circular loop of radius 11.8 cm is placed in a uniform magnetic field. what is the magnetic flux through the loop
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