Question

Which of the following statement is incorrect regarding cathode rays ?

(A) Characteristics cathode rays do not depend upon the material of electrode.

(B) Characteristics cathode rays do not depend upon the nature of the gas.

(C) Cathode rays have no mass and charge.

(D) Cathode rays originate from the cathode.​

Answer 1

Answer:

Characteristics of cathode rays are:

(i) The cathode rays start from the cathode and move towards the anode.

(ii) These rays themselves are not visible but their behaviour can be observed with the help of phosphor materials such as ZnS.

(iii) In the absence of an electrical field or magnetic field, these rays travel in straight lines.

(iv) In the presence of the electrical or magnetic field, the behaviour of cathode rays will be similar to that expected from negatively charged particles.

(v) The characteristics of cathode rays i.e. electrons don't depend upon the material of electrodes.

Thus both assertion and reasons are correct but the reason is not the explanation of the assertion.

Option B is correct.

Explanation:

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