The purpose of a filament in a radio tube is to ........

General Science (Easy) Physics

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The purpose of a filament in a radio tube is to:

Emit heat

Emit light

Emit electrons

Absorb light

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Explanation:

Emit electrons

-The filament (cathode) has a dual function: it emits electrons when heated; and, together with the plate, it creates an electric field due to the potential difference between them. ... Early tubes used the filament as the cathode; this is called a "directly heated" tube.