Question
Calculate the energy in joule equivalent to the mass of one proton. The mass of proton is 1.00728 u. Express the energy in kilowatthour also.

None of these



easy
Solution
The Einstein’s energymass relation is
.
Here,
.
In terms of kilowatthour, we can write
.
SIMILAR QUESTIONS
At a given instant are 25% undecayed radioactive nuclei in a sample. After 10 seconds, the number of undecayed nuclei reduces to 12.5%. Calculate the time in which the number of undecayed nuclei will further reduce to 6.25% of the reduced number.
The normal activity of a living mater containing radioactive carbon C^{14} is found to be 15 decays per minute per gram of carbon. An archaeological specimen shows an activity of 9 decays per minute per gram of carbon. Estimate the age of the specimen. The halflife of C^{14} is 5730 years.
A radioactivity sample contains 2.2 mg of pure which has halflife period of 1224 seconds. Calculate the number of atoms present initially.
A small quantity of solution containing radionuclide (halflife 15 hours) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1 cm^{3} taken after 5 hours show an activity of 296 disintegrations per minute. Determine the total volume of blood in the body of the person.
.
The isotopes occur in nature in the ratio 140 : 1. Assuming that at the time of earth’s formation they were present in equal ratio, make an estimation of the age of the earth. The halflives of respectively.
A radioactive isotope X has a halflife of 3 seconds. At t = 0 second, a given sample of this isotope X contains 8000 atoms. Calculate the number of decays per second in the sample at t = t_{1} second.
A radioactive element of atomic weight 99 has a halflife of 6 hours. Find the activity in a solution containing 1 gram of the element in the beginning. The Avogadro’s number is .
In an ore containing uranium, the ratio of nuclei is 3. Calculate the age of the ore, assuming that all the lead present in the ore is the final stable product of . Take the halflife of .
The mean lives of a radioactive substance are 1620 years and 405 years foremission and emission respectively. Find out the time during which threefourth of a sample will decay if it is decaying both by emission andemission simultaneously.
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An electronpositron pair is produced by the materialization of a gammaray photon of 2.26 MeV. How much kinetic energy is imparted to each of the charged particle? The rest mass of elector is and the speed of light is . Take .