In a cathode ray tube, the cathode plate is coated with oxide of barium or strontium because

They increase the work function of the plate

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They decrease the work function of the plate

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They increase the melting point of the plate

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They decrease the melting point of the plate

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Solution

The correct option is B
They decrease the work function of the plate

If cathode plate (tungsten) is coated with barium and strontium oxide, the work function further reduces to 1 eV and it is sufficient to heat it only to 1000 K to obtain a supply of electrons at a large rate.

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