In a photoelectric cell the collector is tungsten and the emitter is platinum with work function 10 eV. Monochromatic radiation of wavelength 124 Å and power 100 W is incident on the emitter. Quantum efficiency is 1% and the accelerating voltage is 10,000 V. Use hc = 12400 eV·Å. Select the correct statement(s).
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Question

In a photoelectric cell the collector is tungsten and the emitter is platinum with work function 10 eV. Monochromatic radiation of wavelength 124 Å and power 100 W is incident on the emitter. Quantum efficiency is 1% and the accelerating voltage is 10,000 V. Use hc = 12400 eV·Å. Select the correct statement(s).

Select all that apply

G1 Physics · Accepted Answer

Step 1: Photon energy is Eγ = hc/λ and Einstein's equation is Kₘₐₓ = Eγ−φ. Step 2: If a stopping potential is involved, Kₘₐₓ = eVₛ. Step 3: Using the two stated cases eliminates φ or gives it directly. Final: A: The power supplied by the accelerating voltage source is 100 W; B: The minimum wavelength of radiation coming from the tungsten target (collector) is 1.23 Å.