Nucleons are a collection of
The mass of neutron and proton is
The process of emission of natural radiation from some elements is called
C-14: C-12 ratio in a fossil bone is found to be 1/4th that of the ratio in the bone of an animal. The half-life of C-14 is 5730 years, the approximate age of the fossil is
The nucleus contains protons and neutrons which are collectively termed as
The number of protons in the nucleus is called
The greatest ionization power is possessed by
The temperature at the center of the sun is
In the air, the alpha particle has a range of several
The radiation emitted from uranium salt can
In beta decay the nucleon number
The greatest penetration power is of which one?
The lifetime of unstable nuclei is
The process in which two light nuclei combine to form a heavy nucleus is called
If the half-life of the radioactive element is T1/2 then at the end of this time the number of atoms in the sample will become
The simplest atom with a single proton is of
The activity of 1 gram of radium is
The word atom is derived from the Greek word
For curing cancerous tumors and cells, doctors use
As compared to electron, a proton is about
The atoms of an element which have the same number of protons but different number of neutrons in their nuclei are known as
The positive charge in an atom was concentrated in
The time during which half of the unstable radioactive nuclei disintegrate of the sample of a radioactive element is called the
The cosmic radiation consists of
The spontaneous process in which a parent unstable nuclide changes into a more stable daughter nuclide with the emission of radiations is called
The safe level of radiation exposure per year is
To create a shower of secondary radiation, the cosmic radiation interacts with
In each fission event, the energy released is about
The half-life of a radioactive element is 10 minutes. If the initial count rate is 368 counts per minute, then the time for which count rate reaches 46 counts per minute would be?
Radiations burn mainly due to
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