Home
Class 12
PHYSICS
In an experiment tungsten cathode which ...

In an experiment tungsten cathode which has a threshold `2300 Å` is irradiated by ultraviolet light of wavelength `1800Å`. Calculate
(i) Maximum energy of emitted photoelectron and
(ii) Work function for tungsten.
(Mention both the results in electron-volts)
Given Planck's constant `h=6.6 xx 10^(-34) joule-sec`, `leV = 1.6 xx 10^(-19)` joule and velocity of light `c= 3xx10^(8)m//sec`

Promotional Banner

Topper's Solved these Questions

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Discussion question|50 Videos

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Conceptual MCQ|27 Videos

  • NUCLEAR PHYSICS AND RADIOACTIVITY

    PHYSICS GALAXY - ASHISH ARORA|Exercise Concptual MCQs|48 Videos

  • THERMODYNAMICS LAWS & SPECIFIC HEATS OF GASES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Practice Exercise 3.4|11 Videos

Similar Questions

Explore conceptually related problems

In an experiment tungsten cathode which has a threshold wavelength 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å . Calculate (a) maximum energy of emitted photoelectronos & (b) work function of the tungsten

For given enegy, corresponding wavelength will be E = 3.03 xx 10^(-19) Joules (h = 6.6 xx 10^(-34) j X sec., C = 3 xx 10^(8) m/sec

The energy of a photon wavelength k = 1 meter is (Planck's constant = 6.625 xx 10^(-34) Js, speed of light = 3 xx 10^(8) m//s )

Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck' constant h = 6.63 xx 10^-34 Js , speed of light c = 3 xx 10^8 ms^-1 )

If the work function of a and is 3 eV, calculate the threshold wavelength of that metal. (Velocity of light =3xx10^(8)m//s Planck's constant= 6.63xx10^(-34)J-s,1eV=1.6xx10^(-19) )

Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2 V potential stops the emitted electrons. The work function of the material ( in eV) is approximately ( h = 6.6 xx 10^(-34) Js , e = 1.6 xx 10^(-19) C , c = 3 xx 10^(8) ms^(-1))

A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is: [Given Planck’s constant h = 6.6 xx 10^(-34)Js , speed of light c = 3.0 xx 10^(8) m//s ]

PHYSICS GALAXY - ASHISH ARORA-PHOTOELECTRIC EFFECT AND MATTER WAVES-Unsolved numerical problems
  1. In an experiment tungsten cathode which has a threshold 2300 Å is irra...

    Text Solution

    |

  2. Light from balmer series of hydrogen is able to eject photoelectron fr...

    Text Solution

    |

  3. A photocell is operating in saturation mode with a photocurrent 4.8 mA...

    Text Solution

    |

  4. Photo electrons are liberated by ultraviolet light of wavelength 3000 ...

    Text Solution

    |

  5. Lithium has a work function of 2.3eV. It is exposed to light of wavele...

    Text Solution

    |

  6. A parallel beam of monochromatic light of wavelength 663 nm is incide...

    Text Solution

    |

  7. Ultraviolet light of wavelength 800 A and 700 A when allowed to fall ...

    Text Solution

    |

  8. The work functin of aluminium is 4.2 eV. Calcualte the Kinetic energy ...

    Text Solution

    |

  9. What potential difference must be applied to stop the fastest photoele...

    Text Solution

    |

  10. A sphere of radius 1.00 cm is placed in the path of a parallel beam of...

    Text Solution

    |

  11. Find the frequency of light which ejects electrons from a metal surfac...

    Text Solution

    |

  12. state whether the following statements are TRUE or FALSE, giving reaso...

    Text Solution

    |

  13. A point istropic light source of power P = 12 watt is located on the a...

    Text Solution

    |

  14. A uniform monochromatic beam of light of wavelength 365xx10^(-9)m and ...

    Text Solution

    |

  15. Light of wavelength 180 nm ejects photoelectrons from a plate of met...

    Text Solution

    |

  16. Suppose the wavelength of the incident light is increased from 3000 Å ...

    Text Solution

    |

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

    Text Solution

    |

  18. The energy needed to detach the electron of a hydrogen like ion in gro...

    Text Solution

    |

  19. A stationary hydrogen atom emits a photon corresponding to first line ...

    Text Solution

    |

  20. In an experiment tungsten cathode which has a threshold wavelength 230...

    Text Solution

    |

  21. Electrons with maximum kinetic energy 3eV are ejected from a metla sur...

    Text Solution

    |