Question

In commercial electron tubes the current produced by the cathode at 1000 K is about

a.

0.01 A per cm² of cathode surface

b.

0.1 A per cm² of cathode surface

c.

1 A per cm² of cathode surface

d.

5 A per cm² of cathode surface

Answer: (b).0.1 A per cm² of cathode surface

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Q. In commercial electron tubes the current produced by the cathode at 1000 K is about

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