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a sample of 64cu exhibits 3250 cpm after 100 h the same sample gave 2230 cpm calculate the half-life of
a 100-gsample of protein was hydrolyzed a 30-mg portion of 14c-labeled threonine with specific activity of 1000 cpmmg
the streptomycin in 500 g of a broth was determined by addition of 134 mg of the pure antibiotic containing 14c the
describe what quantity is measured and how the measurement is performed for each of the following techniquesa tgab dtac
a 06025-g sample was dissolved and the ca2 and ba2 ions present were precipitated as bac2o4middot h2o and cac2o4amp39
it should be possible to at least partially characterize an oil shale sample using techniques discussed in this chapter
two artifacts in a museum display are hung from vertical walls by very light wires wire t1 is horizontal from the left
the 08-mg car travels over the hill having the shape of a parabola when the car is at point a it is traveling at 9 mgt
if a particle moving along a curved track like a roller coaster flies off the track it continues in the direction of
the procedure to inflate a hot air balloon requires a fan to move an initial amount of air into the balloon envelope
the 64-mm-diameter shaft rotates at 300 revmin this motion is caused by the unequal belt tensions on the pulley of 800
for straightening and smoothing airflow in a 50-cm-diameter duct the duct is packed with a ohoneycomb of thin straws of
a pump forces 1 m3min of water horizontally from an open well to a closed tank where the pressure is 09mpa compute the
potassium-42 is a beta emitter with a half-life of 1236 h calculate the fraction of this radionuclide remaining in a
for a particular radioactive sample the total counting rate sample plus background was 450 cpm and this value was
the chromium in a series of steel samples was determined by icp emission spectroscopy the spectrometer was calibrated
gold can be determined in solutions containing high concentrations of diverse ions by fcp-aes29 aliquots of 500 ml of
nakahara and wasa determined germanium in meteorites by icp-aes using microwave digestion and hydride generation30
a u-shaped tube open to the air at both ends contains some mercury a quantity of water is carefully poured into the
6111 figure p6111 shows data for a portion of the ducting in a ventilation system operating at steady state the ducts
a refrigeration unit has a cop of 4 and extracts 10 kj of heat from the cold reservoir if this machine works as a heat
consider the situation shown in figure 6-e2 calculatea the acceleration of the lo kg blocksb the tension in the string
describe how glow-discharge mass spectrometry is carried out what are the advantages of this
aluminum is to be used as windows for a cell for x-ray absorption measurements with the ag ka line the mass absorption
lezius has described a b-tof mass spectrometer presented the theoretical background for the instrument and provided