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

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.

Text Solution

Verified by Experts

Given ` phi = 4.5 eV , lambda = 200 nm`
Stopping Potential of energy
` = E - phi = hc / lambda - phi`
`= 1242 / 200 - 4.5 `
` = 6.21 -4.5 = 1.71 eV `
Minimum 1.7 V is necessary to stop the electron. The minimum `K.E. = 2eV ` Since the electric potential of 2V is required to accelerate the electron to reach to plates. The max. K.E.
` = ( 2 + 1.7 ) eV = 3.7 eV `
Promotional Banner

Topper's Solved these Questions

  • PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY

    HC VERMA|Exercise Exercise|2 Videos

  • PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY

    HC VERMA|Exercise Objective 2|7 Videos

  • PERMANENT MAGNETS

    HC VERMA|Exercise Exercises|25 Videos

  • PHOTOMETRY

    HC VERMA|Exercise Exercises|16 Videos

Similar Questions

Explore conceptually related problems

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.

This question has statement - 1 and statement - 2 of the four choice given after the statements choose the one that best describes the two statements statement - 1 : A metallic surface is irradiated by a monochromatic light of frequency v gt v_(0) (the threshold frequency). The maximum kinetic energy and the stopping potential are K_(max) and V_(0) respectively if the frequency incident on the surface is doubled , both the K_(max) and V_(0) are also doubled statement - 2 : The maximum kinetic energy and the stopping potential of photoelectron emitted from a surface are linearly dependent on the frequency of incident light

Light of two different frequencies whose photons have energies 1eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum kinetic energy of emitted electrons will be:

Photoelectric effect experiments are performed using three different metal plates p,q and r having work function phi_(p) = 2.0 eV, phi_(e) = 2.5 eV and phi_(r) = 3.0 eV respectively A light beam containing wavelength of 550nm , 450 nm and 350nm with equal intensities illuminates each of the plates . The correct I -V graph for the experiment is [Take hc = 1240 eV nm]

A photoelectric surface is illuminated successively by monochromatic light of wavelength lambda and (lambda)/(2) .If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times in the first case,the work function of the surface of the material is: (h=Plank's constant ,c=speed of light)

Two metallic plate A and B , each of area 5 xx 10^(-4)m^(2) , are placed parallel to each at a separation of 1 cm plate B carries a positive charge of 33.7 xx 10^(-12) C A monocharonatic beam of light , with photoes of energy 5 eV each , starts falling on plate A at t = 0 so that 10^(16) photons fall on it per square meter per second. Assume that one photoelectron is emitted for every 10^(6) incident photons fall on it per square meter per second. Also assume that all the emitted photoelectrons are collected by plate B and the work function of plate A remain constant at the value 2 eV Determine (a) the number of photoelectrons emitted up to i = 10s, (b) the magnitude of the electron field between the plate A and B at i = 10 s, and (c ) the kinetic energy of the most energotic photoelectrons emitted at i = 10 s whenit reaches plate B Negilect the time taken by the photoelectrons to reach plate B Take epsilon_(0) = 8.85 xx 10^(-12)C^(2)N- m^(2)

In a photoelectric effect set up, a point source of light of power 3.2 xx10^(-3) W emits monochromatic photons of energy 5eV .The source is located at a distance of a stationary metallic sphere of work function 3eV and radius 8xx10^(-3)m .The efficiency of photoelectron emission is one for every 10^(6) incident photons.Assume that the sphere is isolated and initially neutral and the photoelectrons are initially swept away after emission. Find the number of photons emitted per second

In the shown expermiental setup to study photoelectric effect, two conducting electrodes are enclosed in an evacuated glass-tube as shown. A parallel beam of monochromatic light, falls on photosensitive electrodes. The emf of battery shwon is high enough such that all photoelectron ejected from left electrode will reach the right electrode. Under initial conditions photoelectrons are emitted. AS changes are made in each situation of column-I, Match the statements in column-I with results in column-II. {:(,"Column I",,"Column II"),((A),"If frequency of incident light is increased keeping its intensity constant",(p),"magnitude of stopping potential"),((B),"If frequency of incident light is increased and its intensity is decreased",(q),"current through circuit may stop"),((C),"If work function of photo sensitive electrode is increased",(r),"maximum kinetic energy of ejected photoelectrons will increase"),((D),"If intensity of incident light is increased keeping its frequency constant",(s),"saturation current will increase"):}

While conduction the Young's double slit experiment, a student replaced the two slits with a large opaque plate in the x-y plane containing two small holes that act as two coherent point sources (S_(1),S_(2)) emitting light of wavelength 600nm. The student mistakenly placed the screen parallel to the x-z plane (for zgt0) at a distance D=3 m from the mid-point of S_(1) , S_(2) , as shown schematically in the figure. The distance between the sources d=0.6003 mm . The origin O is at the intersection of the screen and the line joining S_(1)S_(2) . Which of the following is (are) true of the intensity pattern of the screen?

Light of wavelength 330nm falling on a piece of metal ejects electrons with sufficient energy with required voltage V_0 to prevent them reaching a collector. In the same set up, light of wavelength 220 nm ejects electrons which require twice the voltage V_0 to stop them in reaching a collector. the numerical value of voltage V_0 is

HC VERMA-PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY-Exercises
  1. Find the maximum kinetic energy of the photoelectrons ejected when lig...

    Text Solution

    |

  2. The work function of a photoelectric material is 4.0 e V. (a) What i...

    Text Solution

    |

  3. Find the maximum magnitude of the linear momentum of a photoelectron e...

    Text Solution

    |

  4. When a metal plate is exposed to a monochromatic beam of light of wave...

    Text Solution

    |

  5. In an experiment on photoelectric effect, the stopping potential is me...

    Text Solution

    |

  6. The electric field associated with a monochromataic beam of light beco...

    Text Solution

    |

  7. The electric field associated with a light wave is given by E= E0 sin...

    Text Solution

    |

  8. The electric field at a point associated with a light wave is E=(100Vm...

    Text Solution

    |

  9. A monochromatic light source of intensity 5 m W emits (8xx10^15) photo...

    Text Solution

    |

  10. A photographic film is coated with a silver bromide layer. When light ...

    Text Solution

    |

  11. In an experiment on photoelectric effect light of wavelength 400 nm is...

    Text Solution

    |

  12. A silver ball of radius 4.8 cn is suspended by a thread in a cacuum ch...

    Text Solution

    |

  13. In an experiment on photoelectric effect, the emitter and the collecto...

    Text Solution

    |

  14. In the following arrangement y = 1.0 mm , d = 0.24 mm and D = 1.2 m. T...

    Text Solution

    |

  15. In a photoelectric experiment, the collector plate is at 2.0 V with re...

    Text Solution

    |

  16. A small piece of cesium metal(work function= 1.9eV) is kept at a dista...

    Text Solution

    |

  17. Consider the situation of the previous problem. Consider the fastest e...

    Text Solution

    |

  18. A horizontal cesium plate is moved vertically downward at a constant s...

    Text Solution

    |

  19. A small metal plate of work function phi is kept at a distance r from ...

    Text Solution

    |

  20. A light beam of wavelength 400 nm is incident on a metal of work- func...

    Text Solution

    |