8 26.1 Some important discoveries at the end of the 20th century a Measured the charge of the cathode rays; b Make a static electric deflection of the cathode rays c Measured the charge to mass ratio of the cathode rays d. prove the universal existence of the electron The charge to mass ratio of electron =17588×10C/kg TThe mass of electron m=9.11×10kg 826. 1 Some important discoveries at the end of the 20th century The charge of electron q=-e=-1.602×10-9C The charge of electron is quantized. The discovery of electron was the first clear evidence that the indivisible atoms of nature had structure3 a. Measured the charge of the cathode rays; b. Make a static electric deflection of the cathode rays; c. Measured the charge to mass ratio of the cathode rays; d. Prove the universal existence of the electron. §26.1 Some important discoveries at the end of the 20th century The charge to mass ratio of electron 1.7588 10 C/kg 11 = × m q The mass of electron 9.11 10 kg −31 m = × The charge of electron 1.602 10 C −19 q = −e = − × The discovery of electron was the first clear evidence that the indivisible atoms of nature had structure. §26.1 Some important discoveries at the end of the 20th century The charge of electron is quantized