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Assertion. Cathode rays originate from t...

Assertion. Cathode rays originate from the cathode and move towards andoe.
Reason. Electrons present in the material of the cathode are continuously emitted on applying high voltage

A

If both assertion and reason are true, and reason is the true explanation of the assertion

B

If both assertion and reason are true, but reason is not the true explanation of the assertion

C

If assertion is true, but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
D
Correct A. Cathode rays do not originate from cathode but are produced by the knock out of electrons of the atoms of the gas present in the discharge tube.
Correct R. Electrons are continuously produced from the atoms of the gas present in the discharge tube.
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Knowledge Check

  • Cathode rays move towards

    A
    Positively charged cathode
    B
    Positively charged anode
    C
    Negatively charged cathode
    D
    Negatively charged anode

  • Cathode rays get deflected in an electric field towards

    A
    positive Plat
    B
    negative plate
    C
    no deflection takes place
    D
    both (b) and (c) are correct

  • Kinetic energy of emited cathode rays is dependent on

    A
    only voltage
    B
    only work function
    C
    both (a) and (b)
    D
    it does not depend upon any physical quantity