William Crookes passed an electric current through a tightly sealed tube. The current generated a green beam of light (due to fluorescence as the beam struck a zinc sulfide surface) which seemed to pass from one electrode to the other. This beam was called a cathode ray because
A. it seemed to leave the anode and travel to the cathode.
B. it seemed to leave the cathode and travel to the anode.
C. it seemed to travel from the zinc sulfide screen to the cathode.
D. it seemed to travel from the zinc sulfide screen to the anode.
Answer:B
William Crookes passed an electric current through a tightly sealed tube. The current generated a green beam of light (due to fluorescence as the beam struck a zinc sulfide surface) which seemed to pass from one electrode to the other. This beam was called a cathode ray because
A. it seemed to leave the anode and travel to the cathode. B. it seemed to leave the cathode and travel to the anode. C. it seemed to travel from the zinc sulfide screen to the cathode. D. it seemed to travel from the zinc sulfide screen to the anode.