Dual Nature Of Light Question 209

Question: A photoelectric current emerging in the circuit of a vacuum photocell when its zinc electrode is subjected to electromagnetic radiation of wavelength 262 nm is cancelled if an external decelerating voltage 1.5 V is applied. Find the magnitude of outer contact potential difference of the given photocell. Work function of zinc metal is 3.74 eV.

Solution:

Answer: 0.50

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