Question

Experiments were carried out in which a beam of cathode rays was first bent by a magnetic field and then bent back by an electrostatic field until the beam hit the screen exactly where it had been hitting before the fields were applied. This experiment permitted the direct measurement of a. the ratio of mass to charge of an electron. b. the charge on the nucleus of an atom. c. the charge on the electron. d. the mass of the atom. e. the mass of the electron.

Answer 1

a. the ratio of mass to charge of an electron

Explanation:

The experiment permitted the direct measurement of the ratio of mass to charge of an electron.

• The charge to mass ratio of an electron was determine by accelerating a beam of cathode rays in magnetic and electric fields.
• No matter the gas used in the tube or the nature of the material of the electrodes, the rays were found to have constant charge to mass ratio of 1.76 x 10¹¹coulombkg⁻¹.

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