It is half the time for the radioactive source to become safe. It is half the time it takes for an atom to decay. It is half the time it takes the activity of the source to decrease to zero. It is the time it takes the activity of the source to decrease by half. Two hydrogen nuclei join to form a helium nucleus. A helium nucleus joins with a hydrogen nucleus to form an alpha particle. Uranium nuclei split and produce high energy neutrons causing a chain reaction.
The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be. The disintegrated material is. Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called. Half life of radioactive element depends upon.
Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability of decay during the next time is. Half life of the element is Related: Hydrogen and its compounds Problems. Uncharged particles having the mass equal to proton.
What percentage of original radioactive atoms is left after five half lives? A radioactive nucleus emits a beta particle. The parent and daughter nuclei are. The half-life of radon is 3.
Three forth of a radon sample decay in. C 14 has half life years. At the end of years, the actual amount left is. Nuclear process does not depend on external factors. Exothermic change which increases or decreases with temperature.
A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in years will be. The approximate mass of this element in the sample after two mean lives is. A radioactive element emits particles per second. After three hours 25 particles per second are emitted. The half life period of element will be. The half-life of a radioactive substance is 48 hours.
The half life period of radium is years. The fraction of a sample of radium that would remain after years is. They have no mass or atomic number. Half-life: Half-life is the time period after which half of the quantity of the radioactive element gets decayed. Answer Detailed Solution Below Option 4 : g. Equal to disintegration constant Reciprocal of disintegration constant Directly proportional to disintegration constant Multiples of disintegration constant.
Half-Life : Half-life is the time required for a radioactive substance to reduce to its half initial value. Uranium Radium Bismith Thorium. The correct answer is Thorium. India has the world's largest reserves of Thorium. The known reserves of thorium in India are estimated to be between , and , tonnes. Key Points Thorium Th 90 atomic number, atomic mass is a radioactive chemical element. The country's thorium reserves make up 25 percent of the global reserves. It can easily be used as a fuel to cut down on the import of Uranium from different countries.
It is a useful nuclear reactor fuel. It is silvery white but turns grey or black on exposure to air. Additional Information Uranium is a radioactive chemical element of the actinoid series of the periodic table. Uranium was discovered in by a German chemist Martin Klaproth in the mineral called pitchblende. India claims to have discovered the world's largest uranium reserves in the southern state of Andhra Pradesh. Radium is a silvery-white metal that does not occur free in nature. Bismuth is hard, brittle, lustrous, and coarsely crystalline.
It can be distinguished from all other metals by its color-grey-white with a reddish tinge. Becquerel Gauss Kelvin Newton. Key Points Radioactivity: The atoms having a number of neutrons much more than protons are unstable. The nuclei of such atoms exhibit radioactivity. An example of Such an Atom is U - , where the number of Neutrons is , and the number of protons is Radium is an important radioactive atom. Radioactive decay: The spontaneous breakdown of such an unstable atomic nucleus causes radioactivity.
The number of decays per second, or activity , from a sample of radioactive nuclei, is measured in becquerel Bq. It is named after Henri Becquerel. One Becquerel is equal to one decay per second. C urie is an older unit of radioactivity. It is named after Pierre and Marie Curie. One curie is approximately the activity of 1 gram of radium and equals exactly 3. So, the correct option is Becquerel. Half-life : The time interval in which half of the material gets decayed is called the half-life of the material.
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