The greatest power of ionization is in
The radiations bend in the opposite direction in the magnetic field are
The SI unit for radioactivity is
The activity of 1 g of radium is
When a heavy nucleus such as U-235 splits or fissions into two smaller nuclei by absorbing a small moving neutron, there takes place a
Per year safe limit of radiation exposure is
When alpha and beta particles are slowed down by collisions, they become
Cosmic radiations interact with atoms atmosphere to create
The spontaneous emission of radiation by unstable nuclei is called
The radiation that does not change its direction inside the magnetic field is
The half-life of &15&3N is 6.5 s. A sample of this nuclide of hydrogen is observed for 32.5 s. The fraction of the original radioactive isotope remaining after this time is
The radiation which does not change its direction is
The activity of a sample of radioactive bismuth decreases to one-eighth of the original in 15 days. Its half-life is
Radioisotope for treating cancer tumors and cells is
The strength of radiations to penetrate a certain material is known as
The half-life of carbon-14 is
Times a proton is heavier than an electron is
The temperature at the center of the Sun is nearly
Ashes from a fire in the forest show carbon-14 activity of only 1/8 the activity of fresh wood. How long ago the forest had fire?
In the atmosphere, a small amount is present of radioactive
Radiation that causes redness and sores on the skin is
The radiations emitted by different elements are
The artificially produced radioactive elements are known as
The rate of radioactive decay is proportional to the number of
The release of energy from the sun is due to
In fission, the mass of products is
The radiation which strongly interacts with the matter due to its charge and has a short-range as compared to gamma radiations is
The number of protons and neutrons in the nucleus is called
In alpha decay (α-decay) the proton number of the parent nuclide
In the air, the beta particle has a range of
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