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The number of radioactive nuclei present at the start of an experiment is 4.20 *1015. The number present 23 days later is7.84 *1014. Evaluate the half-life of the nuclei?
(in days)
You have a mechanism by which you can use a magnetic spectrograph to chose the energy of the beta rays from a 137Cs source. What thickness of the brass foils in g/cm2 does it take to stop the 0.8 MeV beta rays
An aluminum-alloy rod has a length of 10.009 cm at 16.200°C and a length of 10.021 cm at the boiling point of water. compute the length of the rod at the freezing point of water
What is the response to the Naturalist concept that human personality, thought, and emotion are purely chemical and electrical reactions.
A particle falls in Earth's gravity. The force of air resistance is F = ??v v(bold) where v(bold) is the velocity, v is the speed, Suppose the initial velocity is 0. How far has the object fallen when the speed is one-half the terminal speed
A box of mass 72.0 kg is connected to a second box with a mass of 34.0 kg. find the magnitude of the tension in the string between the two boxes
an aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of 15degc. both
A beam of electrons is incident on two slits separated by a distance of 2.0×10-6 m. Calculate the kinetic energy of the electrons
If a satellite is placed in orbit about the earth at adistance 2.7 times the earth's radius, what will its velocity be? How many days will it take to circle the earth
What is the reading of spring scale
In an L-R-C series circuit, L = 0.398H , R = 310ohms , and C = 5.91×10?8F . When the ac source operates at the resonance frequency of the circuit, What is the voltage amplitude of the source
An eye has trouble seeing an object closer than 60 cm but needs to see objects at 25 cm from it. find the focal length of a correctly prescribed contact lens
a roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. a passenger feels
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