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Why the cathode rays always are consider...

Why the cathode rays always are considered to be consiste of fundamental common particles called electrons?

Text Solution

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This is because the electrons possess same `( e )/( m) `ratio irrespective of the gas in the discharge tube or the nature of electrodes .This means that the cathode rays do not consist of gaseous charged atoms,otherwise `(e )/( m)` ratio would have been different for different gases taken.
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Knowledge Check

  • Assertion : The characteristics of cathode rays do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube. Reason : Cathode rays consist of negatively charged particles, called electrons.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • In each of the following question a statement of assertion is given followed by a corresponding statement of reason just below it of the statement mark the correct answer as Assertion(A) Cathode rays consists of negatively charged particles called electrons Reason (R) in the presence of electrical field the behaviour of cathode rays is similar to the negatively charged particles.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true and R is not the correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true

  • The cathode rays have particle nature because of the fact that

    A
    They can propagate in vacuum
    B
    They are deflected by electric and magnetic fields
    C
    They produced flurescence
    D
    They cast shadows

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