Physics, 22.11.2019 22:31 andybiersack154
The rubidium isotope 87rb is a β emitter that has a half-life of 4.9 ✕ 1010 y that decays into 87sr. it is used to determine the age of rocks and fossils. rocks containing the fossils of early animal have a ratio of 87sr to 87rb of 0.0040. assuming that there was no 87sr present when the rocks were formed, calculate the age of the fossils.
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Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)
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Physics, 22.06.2019 12:00
You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?
Answers: 2
The rubidium isotope 87rb is a β emitter that has a half-life of 4.9 ✕ 1010 y that decays into 87sr....
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