Which of the following is used as a moderator in nuclear reactor?
"Light water" is the most commonly used moderator (roughly 75% of the world's reactors) although the term is slightly ambiguous, usually meaning natural fresh water, but could also refer to actual light water. Solid graphite (20% of reactors) and heavy water (5% of reactors) are the main alternatives.
Isotopes are separated by
Which among the following is a positively charged particle emitted by a radioactive element?
Atoms are composed of
In an atomic explosion, enormous energy is released which is due to
The wavelength of X-rays is of the order of
Mesons are found in
Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
Which of the following shows the masses of the three elementary particles in decreasing order?
In neutral atom, the electrons are bound to the nucleus by
Which of the following has a least penetrating power?
The age of most ancient geological formations is estimated by
The isotope of uranium capable of sustaining chain reaction is
Who suggested that most of the mass of the atom is located in the nucleus?
The dark lines in the solar spectrum are due to
In an atomic nucleus, neutrons and protons are held together by
'No two electrons in an atom can have the same set of four quantum numbers' is
According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
Atoms of an element differ from those of all other elements in
Nuclear fission is caused by the impact of