Question
What is the difference between cathode rays and canal rays. Why are canal rays called so?

Answer

Sr.NoCathod raysCanal rays
1Cathode rays are those which contain negative ions and are negatively charged.These negative ions are called electrons.Canal rays or positive rays are those which contain positive ions and are positively charged. These positive ions are called protons.
2For cathode rays, the value of e/m ratio of constituent particles does not depend upon nature of gas in the discharge tube.e/m ratio of constituent
particles depend upon nature.
3But magnitude of charge in cathode rays is always.Magnitude of charge in canal rays is +1, but also +2,$+3, \ldots .$.
Canal rays are also known as cathode rays because all the rays move towards the positive side which known as anode and it is because of this it is also known as anode rays

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