JAMB - Chemistry (2009 - No. 8)
Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays?
are positively charged
are negatively charged
have mass
travel in straight lines
解释
Cathode rays travel in a straight line and can cast sharp shadows.
Cathode rays are negatively charged.
Electric field and magnetic field deflect cathode rays.