Laser beam
X-rays
Gamma rays
Cosmic rays
Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material
Shows the masses of the three elementary particles in decreasing order
What is the wavelength of visible spectrum
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
