Athermally isolated system consists of a hot piece of aluminum and a cold piece of copper. the aluminum and the copper are in thermal contact. the specific heat of aluminum is more than double that of copper. which object experiences the greater amount of heat transfer during the time it takes the system to reach thermal equilibrium? a)the aluminum experiences the greater magnitude of heat transfer. b) the copper experiences the greater magnitude of heat transfer. c) both experience the same magnitude of heat transfer.
none of the above
the actual answer is '91 protons'. in fact, the beta decay of the thorium-234 is the following:
where inside the nucleus of thorium (90 protons), a neutron turns into an electron (the beta particle) + a proton. therefore, the resulting nucleus (which is protoactinium) has a total of 90+1 = 91 protons.
so, the correct answer would be '91 protons'.
the first practical realisation of the metric system came in 1799, during the french revolution, when the existing system of measures, which had become impractical for trade, was replaced by a decimal system based on the kilogram and the metre.