How did Sir William Crookes' work move science forward toward the discovery of
a. He coined the term cathode ray to describe electrons emitted from an
evacuated tube that could produce fluorescence.
b. He found that cathode rays appear to travel in a straight line.
c. He investigated the penetrating power of cathode rays through metal sheets.
d. He was the first to measure the ionization potential of cathode rays.
What did William Hittorf discover in his experiments with the Crookes' tube in
a. Cathode rays would leave an impression on a photographic plate.
b. A solid body placed between the cathode ray and the area of
cast a shadow on the walls of the Crookes vacuum tube.
c. Cathode rays were not x-rays.
d. The Voltaic Pile could produce a continuous electric charge.
In 1893, Philippe Lenard gained notoriety for being the first scientist to
a. Cathode rays appeared to travel in a straight line and could be easily
b. The electrons emitted from an evacuated tube produced florescence and
could be deflected by a magnet.
c. Electrons leaving the cathode ray are attracted to the anode by the high
d. There was a photoelectric effect of ultraviolet light on metal.