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12904
_] At once, physicists became fascinated with X rays and began searching for them everywhere. One of those involved in the search was the French physicist Antoine Henri Becquerel (1852 1908). AT ONCE PHYSICISTS BECAME FASCINATED WITH X RAYS AND BEGAN SEARCHING FOR THEM EVERYWHERE ONE OF THOSE INVOLVED IN THE SEARCH WAS THE FRENCH PHYSICIST ANTOINE HENRY BECAREL EIGHTEEN FIFTY TW
two types of mass-containing particles were known. There were the atoms, which made up ordinary matter, and the electrons, which made up electric current. Radioactivity Was there a connection between these two sets of particles—atoms and electrons? In 1897, when the electron was discovered, a line of research that was to tie the two kinds of particles together had already begun. In 1895 the German physicist Wilhelm Konrad Roentgen (1845-1923) was working with cathode rays. He found that if he made the cathode rays strike the glass at the other end of the tube, a kind of radiation was produced. This radiation was capable of penetrating glass and other matter. Roentgen had no idea as to the nature of the radiation, and so called it “X rays”. This name, containing “X” for “unknown”, was retained even after physicists worked out the nature of X rays and found them to be light-like radiation made up of waves much shorter than those of ordinary light. [Illustration: _Antoine Henri Becquerel. O TYPES OF MASS CONTAINING PARTICLES WERE KNOWN THERE WERE THE ATOMS WHICH MADE UP ORDINARY MATTER AND THE ELECTRONS WHICH MADE UP ELECTRIC CURRENT RADIO ACTIVITY WAS THERE A CONNECTION BETWEEN THESE TWO SETS OF PARTICLES ADAMS AND ELECTRONS IN EIGHTEEN NINETY SEVEN WHEN THE ELECTRON WAS DISCOVERED A LINE OF RESEARCH THAT WAS TO TIE THE TWO KINDS OF PARTICLES TOGETHER HAD ALREADY BEGUN IN EIGHTEEN NINETY FIVE THE GERMAN PHYSICIST WILHELM CONRAD RENKIN EIGHTEEN FORTY FIVE NINETEEN TWENTY THREE WAS WORKING WITH CATHODE RAYS HE FOUND THAT IF HE MADE THE CATHODE RAYS STRIKE THE GLASS AT THE OTHER END OF THE TUBE A KIND OF RADIATION WAS PRODUCED THIS RADIATION WAS CAPABLE OF PENETRATING GLASS AND OTHER MATTER RENKIN HAD NO IDEA AS TO THE NATURE OF THE RADIATION AND SO HE CALLED IT X RAYS THIS NAME CONTAINING THE X FOR UNKNOWN WAS RETAINED EVEN AFTER PHYSICISTS WORKED OUT THE NATURE OF X RAYS AND FOUND THEM TO BE LIGHT LIKE RADIATION MADE UP OF WAVES MUCH SHORTER THAN THOSE OF ORDINARY LIGHT
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