Chemistry

It is a phenomenon that occurs in a number of substances. Atoms of the substances spontaneously emit invisible but energetic radiations, which can penetrate materials that are opaque to visible light. The effects of these radiations can be harmful to living cells but, when used the right way, they have wide range of beneficial applications.

• Reactivity

• Radioactivity

• Inactivity

• None of the Above

The element uranium was discovered by Martin Klaproth on _______________.

• 1789

• 1879

• 1987

• none of the above

When Dmitri Mendeleyev developed the periodic law of elements, which later evolved in the Table of Elements

• 1896

• 1986

• 1869

• 1996

When Balmer published an empirical formula that gives the observed wavelength of hydrogen light spectra.

• 1885

• 1895

• 1985

• 1995

When Thorium is first used in mantles for camping lanterns

• 1880

• 1890

• 1900

• 1990

When Wilhelm Roentgen discovered X-rays on 8th November 1895; the World immediately realizes its medical potential and he won the Novel Prize in 1901

• 1893

• 1894

• 1895

• 1896

Who discovered radioactivity on 26 February 1896 and shared the Nobel Prize with P. Curie

• J.J. Thomson

• Marie and Pierre Curie

• Ernest Rutherford

• Henri Becquerel

Who discovers the electron?

• Henri Becquerel

• Marie and Pierre Curie

• J.J. Thomson

• None of the Above

Who discovered technetium-99m - an isotope currently used in nuclear medicine?

• Enrico Fermi

• Emilio Segre and Glenn Seaborg

• John Livingoof

• Glenn Seaborg

Who funds the first cyclotron dedicated for biomedical radioisotope production at Washington University in St. Louis?

• Manhattan Project

• John Livingoof

• The Rockefeller Foundation

• Otto Hahn and Fritz Strassman