Suppose we have a simple discharge tube with two electrodes connected externally through ammeter and battery and evacuated internally.Now we shine radiation of suitable frequency on emmitter so that electrons are emmitted and photocurrent flows.Now my doubt, is the current flowing in external circuit measured by ammeter the same as that flows in the vacuum between the two electrodes due to photoelectric effect?Suppose 100 electrons are emitted per second from emitter plate.Will 100 electrons pass through any cross-sectional area in between the two electrodes and is the expression I=neAv valid for photocurrent?
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Yes. If everything is in series (ammeter, battery, discharge tube), then the current must be the same everywhere.
What are you wondering? Are you worried that the current in the tube is really low?
Oscar Bravo
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