measuring radioactivity and models of the atom

(6.14) Explain why GM tubes are Bette at detecting alpha particles than beta- or gamma rays

Alpha particle are more ionising so more electrons are released per collision so its easier to detect from the acitivity/current produced

(6.14) ________ darkens photographic film

radiation

(6.17) describe the plum pudding model

negative electrons in a uniform of positive charge

(6.17) who discovered the positive nucleus

rutherford

(6.17) describe the alpha particle scattering experiment

a beam of alpha particles were shot at thin gold foil, most alpha particles are deflected and some are scattered

(6.17) what conclusion did Rutherford make when most alpha particles passed through the sheet of gold

atoms are mostly empty space

(6.17) what conclusion did Rutherford make when some alpha particles deflected off the sheet of gold

nucleus is positive

(6.17) what conclusion did Rutherford make when some alpha particles bounced back

nucleus is tiny and dense

(6.17) describe the Rutherford model

atoms is mostly empty space with a positive nucleus which contains most the mass of the atom

(6.17) describe the Bohr model

electrons orbited a positive nucleus in well-defined energy levels