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Question: Cathode rays have: A) Mass only B) Charge only C) Both mass and charge D) Neither mass nor ...

Cathode rays have:
A) Mass only
B) Charge only
C) Both mass and charge
D) Neither mass nor charge

Explanation

Solution

Cathode ray are emitted from cathode ray tubes. It is produced by applying a high voltage across two electrodes at one end of the tube, which causes a beam of particles to flow from the cathode (the negatively-charged electrode) to the anode (the positively-charged electrode).

Complete step by step answer:
Cathode rays are so named because they are emitted by the negative electrode, or cathode. Since the electrons have a negative charge, they are repelled by the negative cathode and attracted to the positive anode. They travel in straight lines through the empty tube. The cathode rays would deflect toward the positively charged plates, and away from the negatively charged plates because of the electrons present in it. The cathode rays accelerate vertically downwards under the influence of the constant downward force downwards on them due to the electric field produced by the charged plates. The cathode rays move at constant speed horizontally and faster towards the positively charged plate.
Cathode rays have energy and can do work. They are deflected by electric and magnetic fields because of having negative charge. The presence of cathode rays was first detected in early vacuum tubes when they struck the glass wall of the tube, exciting the atoms of the glass and causing them to emit light which is commonly called fluorescence.

Therefore, Option C is the correct answer.

Additional Information:
The anode of a device is the terminal where current flows in from outside. The cathode of a device is the terminal where current flows out. Since electrons are negatively charged, current flows in the direction opposite to the flow of electrons.

Note: Cathode rays are negatively charged rays because of the presence of electrons and anode rays are positively charged rays. They flow in opposite directions because of the charge present in it. These rays are responsible for the discovery of subatomic particles.