During canal ray experiment for hydrogen gas, the $e / m$ values obtained were not same Justify.

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Solution

Canal rays means anode rays.while calculating e/m values of anode rays when hydrogen gas is present in tube we may get different e/m values for the same hydrogen gas because of the presence of isotopes which are the atoms of same element but different mass. Here the e/m value of anode rays depends on mass of the rays.

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During canal ray experiment for hydrogen gas, the e/m values obtained were not same Justify.

During canal ray experiment for hydrogen gas, the $e / m$ values obtained were not same Justify.