Home
Class 12
PHYSICS
The stopping potential of a photoelectri...

The stopping potential of a photoelectric diode is 9 volts. `e//m = 1.8 xx 10^(11) C kg^(-1)` , then what is its velocity ?

A

`32. 4 xx 10^(11)` m/s

B

`18 xx 10^5` m/s

C

`16.2 xx 10^5` m/s

D

`4.02 xx 10^5` m/s

Text Solution

Verified by Experts

The correct Answer is:
B
Let `v_(max)` be the maximum velocity of the photoelectrons.
`therefore 1/2 mv_("max")^(2) = eV_0` (where `V_0` is the stopping potential)
`therefore v_("max") = sqrt(2V_0 . (e)/(m))=sqrt(2 xx9 xx1.8xx 10^(11))`
`=18 xx 10^5 ms^(-1)`
`= 18 xx 10^5 ms^(-1)`
Promotional Banner

Topper's Solved these Questions

  • PARTICLE NATURE OF LIGHT AND WAVE PARTICLE DUALISM

    MTG-WBJEE|Exercise WB JEE PREVIOUS YEARS QUESTIONS|15 Videos

  • OSCILLATIONS AND WAVES

    MTG-WBJEE|Exercise WB JEE PREVIOUS YEARS QUESTIONS (CATEGORY 3: ONE OR MORE THAN ONE OPTION CORRECT TYPE (2 MARKS))|2 Videos

  • SOLID STATE ELECTRONS

    MTG-WBJEE|Exercise WB JEE Previous Years Questions (CATEGORY 1 : Single Option Correct Type)|15 Videos

Similar Questions

Explore conceptually related problems

When radiation is incident on a photoelectron emitter , the stopping potential is found to be 9 volts . If e//m for the electrons is 1.8 xx 10^(11) C kg^(-1) the maximum velocity of the ejected electrons is

Maximum velocity of the photoelectron emitted by a metal surface is 1.2 xx10^(6) m s^(-1) . Assuming the specific change of the electrons to be 1.8 xx10^(11) C kg ^(-1) kg the value of the stopping potential in volt will be

An electron is accelerated through a potential difference of 200 volts. If e//m for the electron be 1.6 xx 10^(11) coulomb/kg, the velocity acquired by the electron will be

Maximum velocity of photoelectron emitted is 4.8 ms^(-1) . If e/m ratio of electron is 1.76xx10^(11)Ckg^(-1) , then stopping potential is given by

The electric potential in volts due to an electric dipole of dipole moment 1 xx 10^(-8)C-m at a distance of 3m on a line making an angle of 30^(@) with the axis of dipole is

In the uniform electric field of E = 1 xx 10^(4) N C^(-1) , an electron is accelerated from rest. The velocity of the electron when it has travelled a distance of 2 xx 10^(-2) m is nearly ( (e)/(m) of electron = 1.8 xx 10^(11) C kg^(-1) )

When radiation is incident on a photoelectron emitter, the potential is found to be 9V. If e//m for the electron is 1.8cc10^(11)C//kg , the maximum velocity of the ejected electron is

a. A stopping potential of 0.82V is required to stop the emission of photoelectrons from the surface of a metal by light of eavelength 4000 A . For light of wavelength 3000 A , the stopping potential is 1.85V . Find the value of Planck's constant. [1 electrons volt (eV) =1.6xx10^(-19)J] b. At stopping potential, if the wavelength of the incident light is kept fixed at 4000 A , but the intensity of light increases two times, will photoelectric current be botained ? Give reasons for your answer.

The maximum velocity of photoelectronos emitted hy a photoemitter is 1.8 xx 10^(6) m//sec . Taking e//m = 1.8 xx 10^(11) C/kg for electrons, the stopping potential of the emitter is:

MTG-WBJEE-PARTICLE NATURE OF LIGHT AND WAVE PARTICLE DUALISM-WB JEE PREVIOUS YEARS QUESTIONS
  1. The stopping potential of a photoelectric diode is 9 volts. e//m = 1.8...

    Text Solution

    |

  2. The de Brogile wavelength of an electron (mass =1 xx 10^(-30) kg, char...

    Text Solution

    |

  3. The energy of gamma (gamma) ray photon is E(gamma) and that of an X-ra...

    Text Solution

    |

  4. The work function of a metal is in the range of 2 eV to 5 eV. Find whi...

    Text Solution

    |

  5. The potential difference V required for accelerating an electron to ha...

    Text Solution

    |

  6. The work function of cesium is 2.27 eV. The cut-off voltage wich stops...

    Text Solution

    |

  7. When light of frequency v1 incident on a metal with work function W0 (...

    Text Solution

    |

  8. The de-Broglie wavelength of an electron is 0.4 xx 10^(-10) m when its...

    Text Solution

    |

  9. An electron accelerated through a potential of 10,000 V from rest has ...

    Text Solution

    |

  10. A proton and an electron initially at rest are accelerated by the same...

    Text Solution

    |

  11. The stopping potential for photoelectrons from a metal surface is V(1)...

    Text Solution

    |

  12. The de-Broglie wavelength of an electron is the same as that of a 50 k...

    Text Solution

    |

  13. Select correct statement(s) about photoelectric effect.

    Text Solution

    |

  14. In which of the following situations, the heavier of the two particle...

    Text Solution

    |

  15. The distance between a light source and photoelectric cell is d. If th...

    Text Solution

    |

  16. Electrons are emitted with kinetic energy T from a metal plate by an i...

    Text Solution

    |