(e/m) ratio of anode rays produced in discharge tube, depends on the

1.	(e/m) ratio of anode rays produced in discharge tube, depends on the
A.	Nature of the gas filled in the tube
B.	Nature of the material of anode
C.	Nature of the material of cathode
D.	All of the aboveq
Answer» B. Nature of the material of anode

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(e/m) ratio of anode rays produced in discharge tube, depends on the

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