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Answer the following questions:
Question I. A radioactive sample produces 46035 decays per minute at one point in an experiment and 308.09 days later produces 837 decays per minute.
Part i. What is the half time?
Part ii. What is the decay constant?
Part iii. What is the mean lifetime of the material?
Question II. What fraction of a sample of carbon-14 is left after 21487.5 yr. (the half-life of carbon-12 is 5730 yr.)
Question III. What period of time is required for a sample of radioactive uranium-235 to lose 99.280% of its activity? (The half-life of uranium is 7.038*10 yr).
Explain the each step.
a proton moves in a constant electric field from point a to point b. the magnitude of the electric field is 6.4 times
A 5.7 kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. What is the amplitude of the motion
A constant magnetic field of magnitude 0.45 T is directed along the +y axis. The length of each rod is L = 1.3 m, and the speeds are the same, vA = vB = vC = 2.7 m/s. For each rod, find out the magnitude of the motional emf, and indicate which end..
Perpetual motion machines have fascinated people especially inventors for hundreds of years before the laws of thermodynamics became known. Ideally, once energy is added to start a perpetual motion in machine, the machine would continue to operate..
a string has a linear density of 4.80 10-3 kgm and is under a tension of 345 n. the string is 1.5 m long is fixed at
A car is traveling north at 17.7m/s. After 12s its velocity is 14.10m/s in the same direction. Find the magnitude and direction of the car's average acceleration.
A 45-m length of wire is stretched horizontally between twovertical posts. The wire carries a current of 76 A and experiences a magnetic force of 0.15 N.
In atwood's machine two masses m1 and m2 hang vertically, connected over a frictionless pulley. Evaluate the acceleration numerically
A drop of water on a countertop reflects light from a flower held3.10 cm directly above it. What is the focal length of the water drop
With brakes fully applied, a 1430kg car decelerates from a speed of 74km/hr. What is the work done by the braking force in bringing car to a stop.
a block of mass m=2.00kg is attached to the end of an ideal spring and its initially hanging motionless. with what angular frequency will the block oscillate
A jet with mass m = 130000.0 kg jet accelerates down the runway for takeoff at 1.5 m/s2. What is the net horizontal force on the airplane as it accelerates for takeoff
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