the phenomenom of natural radioactivity
Marie Curie (1867-1934) y Pierre Curie (1859-1906)
They studied radiactive materials, particularlyUranium in Pechblenda form Pechblenda is more radoactive than Uranium, so there could be elements in Pechblenda that makes it more radioactive They discovered to chemist elements: Radium and Polonium Pierre has an accident with horses and died Marie died because of the radioactivity
room Cathodic rays tube enfolded (with black paper) and turned on Cardboard with barium saltThe cathodic rays tube lets out an invisible ray, this ray pass over the black paper, reach the table and makes that the barium salt cristals shine on the dark If the cathodic rays tube goes off,theres no shine on the cristals
It shining althought were inteject various materials like books, paper, wood, glass, rubber, aluminium, a hand!! The rays are not affected by magnetic fields Theserays produce pictures in photographic plates So the CRT emit a new type of invisible ray that do not contains electric particles, it can pass over objects and produce pictures This new type ofradiation is called “X rays”
emision of light by certain chemical substances if they are exposed to the sun light----PITCHBLENDE Emit X rays these fluorescent substances…..? And produce they photographic impresions…?
emit radiation of high energy even in the dark!! And print pictures The Pitchblende “Uranium” emits spontaneously ahigh energy radiation called RADIOACTIVITY!!
β rays γ rays α rays Radioactive (-)
Electrically charged plates
had designed anexperiment to study how alpha particles interact with thin metal foils
Fluorescent screen Lead box Thin gold foil
atom is like a “raisin puddin”, the poddin...