Home
Class 12
PHYSICS
In a photoelectric experiment, the colle...

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.
Promotional Banner

Topper's Solved these Questions

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Exercise - 11|2 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Exercise - 12|2 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Exercise - 09|2 Videos

  • RACE

    ALLEN|Exercise Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)|25 Videos

  • TEST PAPER

    ALLEN|Exercise PHYSICS|4 Videos

Similar Questions

Explore conceptually related problems

In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of copper '(phi = 4.5)'. The emitter is illuminated by a source of monochromatic light of wavelength 200nm. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.

In an experiment on photoelctric effect, light of wavelength 800 nm ( less than threshold wavelength) is incident on a cessium plate at the rate of 5.0W . The potential of the collector plate is made sufficiently positive with respect to the emitter so that the current reaches its saturation value. Assuming that on the average one of every 10^(6) photons is able to eject a photoelectron, find photo current in the circuit.

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

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 :

In an experiment on photoelectric effect light fo wavelength 400 nm is incident on a metal plate at rate of 5W. The potential of the collector plate is made sufficiently positive with respect to emitter so that the current reaches the saturation value. Assuming that on the average one out of every 10^6 photons is able to eject a photoelectron, find the photocurrent in the cirucuit.

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 ) What is the power supplied by the accelerating voltage source.