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Q.

The e/m ratio of cathode rays is x  unit, when hydrogen is filled in the discharge tube. What will be the e/m  ratio of cathode rays when oxygen (O2)  is filled in it ?

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a

x  unit

b

x2unit

c

2x  unit

d

x4 unit

answer is A.

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e/m   ratio of cathode rays are independent of nature of a gas
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The e/m ratio of cathode rays is x  unit, when hydrogen is filled in the discharge tube. What will be the e/m  ratio of cathode rays when oxygen (O2)  is filled in it ?