Thomson was the first to determine experimentally the speed
Chapter Eleven
DUAL NATURE OF
RADIATION AND
MATTER
Rationalised 2023-24
275
Dual Nature of Radiation
and Matter
and the specific charge [charge to mass ratio (e/m)] of the cathode ray
particles They were found to travel with speeds ranging from about 0 1
to 0 2 times the speed of light (3 ×108 m/s)