A photocell employs photoelectric effect to convert

In an experiment on the photoelectric effect, an evacuated photocell with a pure metal cathode is used. Which graph best represents the variation of V, the minimum potential difference

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The collecter of the photocell (in photoelectric experiment ) is made of tugsten while the emitter is Platinum having work function of 10eV .Monochromotic radiation of wavelength 124Å & power 100 watt is incident on emitter which emits photo electrons with a quantum efficiency of 1% .The accelerating voltage acros the photocell is of 10,000 volts (Use: hc=12400eVÅ ) The minimum wavelength of radiation coming from the tungsten target (collector) is

If the distance of 100 Watt lamp is increased from a photocell, the saturation current i in the photo cell varies with distance d as.