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8500 - 9800 angstrom
7800 - 8000 angstrom
3900 - 7600 angstrom
1300 - 3000 angstrom
Which of the following has a least penetrating power
The isotope of uranium capable of sustaining chain reaction is
The age of most ancient geological formations is estimated by
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
Atoms of an element differ from those of all other elements in
Nuclear fission is caused by the impact of
Which of the following rays are more penetrating