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electromagnetic radiation Eo (eV) 2.30 Element Potassium ammeter evacuated tube Sodium 2.75 Aluminum 4.28 Tungsten 4.55 voltmeter Copper 4.65 Iron 4.70 Gold 5.10 battery

electromagnetic radiation Eo (eV) 2.30 Element Potassium ammeter evacuated tube Sodium 2.75 Aluminum 4.28 Tungsten 4.55 voltmeter Copper 4.65 Iron 4.70 Gold 5.10 battery

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The diagram below shows the experimental set-up for observing the
photoelectric effect. The table provides values for the work function for several elements. (The work function is the amount of energy required to free the outermost electron from that element.)

It is found that a certain voltage stops the current from flowing around the circuit. When the experiment is repeated, it is found that the stopping voltage has increased. Which of the following could explain the change between experiments?

a) The metal was changed to one with a lower work function.

b) The light intensity decreased.

c) The light frequency decreased.

d) None of the above.

electromagnetic radiation Eo (eV) 2.30 Element Potassium ammeter evacuated tube Sodium 2.75 Aluminum 4.28 Tungsten 4.55 voltmeter Copper 4.65 Iron 4.70 Gold 5.10 battery
Transcribed Image Text:electromagnetic radiation Eo (eV) 2.30 Element Potassium ammeter evacuated tube Sodium 2.75 Aluminum 4.28 Tungsten 4.55 voltmeter Copper 4.65 Iron 4.70 Gold 5.10 battery
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