The highest value of $e / m$ of anode rays has been observed, when the discharge tube is filled with :

Nitrogen

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Oxygen

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Hydrogen

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Helium

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Solution

The correct option is B Hydrogen
The highest value of $e / m$ of anode rays has been observed, when the discharge tube is filled with Hydrogen.
The value of $e / m$ for an electron = $1.76 \times 10^{8} C / g$ . For the $H^{+}$ ion (proton),
$e / m = 96500 / 1.008 C / g$ .

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Deflection of anode rays is maximum when the discharge tube is filled with hydrogen gas.

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