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Thermal Radiation. Quantum Nature of Light.

Problem 5.279

A photoelectric current emerging in the circuit of a vacuum photocell when its zinc electrode is subjected to electromagnetic radiation of wavelength 262nm262 \mathrm{nm} is cancelled if an external decelerating voltage 1.5 V1.5 \mathrm{~V} is applied. Find the magnitude and polarity of the outer contact potential difference of the given photocell.

Reveal Answer
0.5 V; the polarity of the contact potential difference is opposite to that of external voltage.0.5 \mathrm{~V} ; \text { the polarity of the contact potential difference is opposite to that of external voltage.}
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