Home
Class 12
PHYSICS
In a photoelectric emission, electrons a...

In a photoelectric emission, electrons are ejected from metals X and Y by light of frequency f. The potential difference V required to stop the electrons is measured for various frequencies.. If Y has a greater work function than X, which graph illustrates the expected results?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A

Greater work function greater intercept
Promotional Banner

Topper's Solved these Questions

  • SIMPLE HARMONIC MOTION

    ALLEN |Exercise Exercise-02|19 Videos
  • SIMPLE HARMONIC MOTION

    ALLEN |Exercise Exercise- 3 Match The Column|1 Videos
  • SIMPLE HARMONIC MOTION

    ALLEN |Exercise SOME WORKED OUT EXAMPLES|29 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

For photoelectric emission from certain metal the cutoff fequency is v.If radiation of frequency 2 v impinges on the metal plate,the maximum possible velocity of the emitted electron will be (m is the electron's mass),

For photo senstive surface A and B graph of stopping potential versus frequency (v) is shown in figure .From graph work function of A surface …..

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"):}

In an experiment, electrons are made to pass through a narrow slit of width d comparable to their de Broglie wavelength. They are detected on a screen at a distance D from the slit (see figure) . Which of the following graphs can be expected to represent the number of electrons N detected as a function of the detector position y (y=0 corresponds to the middle of the slit ).

Wave property of electrons implies that they will show diffraction effects. Davission and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure) The surface of a metal is illuminated with the light of 400 nm . The kinetic energy of the ejected photoelectrons was found to be 1.68 eV . The work function of the metal is : ( hc = 1240 eV-nm )

Figure shows graph of stopping potential v frequency in experiment of photo-electric effect work function of metal will be……e=change of electron.

(i) In the explanation of photoelectric effect we assume one photon of frequency with v collides with an electron and transfers its energy.This lead to the equation for the maximum energy E_(max) of the emitted electron as E_(max)=hv-phi_(0) Where phi_(0) is the work function of the metal If an electron absorbs 2 photon (each of frequency v)What will be the maximum energy for the emitted electron? (ii)Why is this fact (two photon absorption)not taken into consueration in our discussion of the stopping potential?

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800A . Calculate threshold frequency (V_(0)) and work function (W_(0)) of the metal.

Photo-electric emission is observed from a metalli surface for frequenceis f_(1) and f_(2) of the incident light. (f_(1)gtf_(2)) .If the maximum values of K.E. of photo-electrons emitted in two cases are in the ratio 1:n, then the threshold frequency of a metallic surface is .......

ALLEN -SIMPLE HARMONIC MOTION-Exercise-01
  1. 1.5 mW of 400 nm light is directed at a photoelectric cell. If 0.1% of...

    Text Solution

    |

  2. Let K(1) be the maximum kinetic energy of photoelectrons emitted by a ...

    Text Solution

    |

  3. In a photoelectric emission, electrons are ejected from metals X and Y...

    Text Solution

    |

  4. White light consisting of wavelengths 380 nm le lambda le 750 nm is in...

    Text Solution

    |

  5. The de Broglie waves are associated with moving particles. These parti...

    Text Solution

    |

  6. Which of the following statements is wrong?

    Text Solution

    |

  7. Two paricles have idential charges. If they are accelerated throgh sam...

    Text Solution

    |

  8. Linear momenta of a proton and an electrons are euqal. Then

    Text Solution

    |

  9. The wavelength of de-Brogile waves associted with neutrons at room tem...

    Text Solution

    |

  10. Light coming from a discharge tube filled with hydrogen falls on the c...

    Text Solution

    |

  11. If elements with principal quantum number ngt 4 were not allowed in na...

    Text Solution

    |

  12. If 13.6 eV energy is required to ionized the hydrogen atom, then the e...

    Text Solution

    |

  13. The diagram shows the energy levels for an electron in a certain atom....

    Text Solution

    |

  14. The muon has the same change as an electron but a mass that is 207 tim...

    Text Solution

    |

  15. In problems involving electromagenetism it is often convenlent and inf...

    Text Solution

    |

  16. Which of the following transitions in hydrogen atoms emit photons of h...

    Text Solution

    |

  17. The velocity of an electron in single electron atom in an orbit

    Text Solution

    |

  18. The energy level diagram is for a hypotenitcal atom. A gas of these at...

    Text Solution

    |

  19. The wave number of the series limit of Lyman series is -

    Text Solution

    |

  20. In a hypothetical system , a particle of mass m and charge -3 q is mov...

    Text Solution

    |