In a photoelectric experiment, the collector plate is at 2.0V with respect to the emitter plate made of copper `(phi)=4.5eV)`. The emitter is illuminated by a source of monochromatic light of wavelength 2000 `Å`nm.
In a photoelectric experiment, the collector plate is at 2.0V with respect to the emitter plate made of copper `(phi)=4.5eV)`. The emitter is illuminated by a source of monochromatic light of wavelength 2000 `Å`nm.
A
The maximum kinetic energy of the photoelctrons reaching the collector is `0`.
B
The maximum kinetic energy of the photoelctrons reaching the collector is `3.7` .eV.
C
If the polarity of the battery is reversed then answer to part A willl be 0
D
If the polarity of the battery is reversed then answer to part B will be `1.7 eV`
Text Solution
Verified by Experts
The correct Answer is:
B
`K_(max) = (1242)/(200) eV - 4.5 eV`
`K_(max) = 1.7 eV` at cathode
`K_(max) = (1.7 + 2) eV` at anode
If polarity is reversed, no `e^(-)` reach at collector.
`K_(max) = 1.7 eV` at cathode
`K_(max) = (1.7 + 2) eV` at anode
If polarity is reversed, no `e^(-)` reach at collector.
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Knowledge Check
The collecter of the photocell (in photoelectric experiment ) is made of tugsten while the emitter is Platinum having work function of 10 eV .Monochromotic radiation of wavelength 124 Å & 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=12400eV Å ) If the source of monochromatic radiation of wavelength 124 Å has an efficiency of 50% , and the power of X ray emitted by the tungsten target is 3W , the overall efficiency of the apparatus for X-ray production is
The collecter of the photocell (in photoelectric experiment ) is made of tugsten while the emitter is Platinum having work function of 10 eV .Monochromotic radiation of wavelength 124 Å & 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=12400eV Å ) If the source of monochromatic radiation of wavelength 124 Å has an efficiency of 50% , and the power of X ray emitted by the tungsten target is 3W , the overall efficiency of the apparatus for X-ray production is
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When a certain photosensistive surface is illuminated with monochromatic light of frequency v, the stopping potential for the photo current is -V_(0)//2 . When the surface is illuminated by monochromatic light of frequency v//2 , the stopping potential is -V_(0) . The threshold frequency gor photoelectric emission is :
When a certain photosensistive surface is illuminated with monochromatic light of frequency v, the stopping potential for the photo current is -V_(0)//2 . When the surface is illuminated by monochromatic light of frequency v//2 , the stopping potential is -V_(0) . The threshold frequency gor photoelectric emission is :
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`(5v)/(3)`
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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 10 eV .Monochromotic radiation of wavelength 124 Å & 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=12400eV Å ) The minimum wavelength of radiation coming from the tungsten target (collector) is
The collecter of the photocell (in photoelectric experiment ) is made of tugsten while the emitter is Platinum having work function of 10 eV .Monochromotic radiation of wavelength 124 Å & 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=12400eV Å ) The minimum wavelength of radiation coming from the tungsten target (collector) is
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`1.24 Å`
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D
`12.3 Å`
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