Home
Class 12
PHYSICS
Light of wavelength 2475 Å is incident o...

Light of wavelength 2475 Å is incident on barium . Photo electrons emitted describe a circle of radius 100 cm by a magnetic field of flux density `1/sqrt17xx10^(-5)` tesla. Find the work function of the barium . (Given `e/m=1.7xx10^11`)

Text Solution

Verified by Experts

K.E of electron, `K=(e^(2)B^(2)r^(2))/(2m)`
`K=((e)/(m))(eB^(2)r^(2))/(2)=8xx10^(-20)J=0.5eV`
Work funtion `W=E-K_(max)=(12400)/(2480)-0.5eV=4.5eV`
Promotional Banner

Topper's Solved these Questions

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH SERIES|Exercise EXERCISE-I|65 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH SERIES|Exercise EXERCISE-I ASSERTION AND REASON|4 Videos

  • CURRENT ELECTRICITY

    AAKASH SERIES|Exercise EXERCISE - IA|2 Videos

  • ELECTRIC CHARGES AND FIELDS

    AAKASH SERIES|Exercise Practice Exercise|57 Videos

Similar Questions

Explore conceptually related problems

Light of wavelength 2475 Å is incident on barium. Photoelectrons emitted describe a circle of radius 100 cm by a magnetic field of flux density (1)/(sqrt(17)) xx 10^(-5) Tesla . Work function of the barium is (Given (e )/(m) = 1.7 xx 10^(11) )

Light of wavelength 4000Å is incident on barium. Photoelectrons emitted describe a circle of radius 50 cm by a magnetic field of flux density 5.26xx10^-6 tesla . What is the work function of barium in eV? Given h=6.6xx10^(-34)Js , e=1.6xx10^(-19)C, m_e=9.1xx10^(-31)kg.

When light of wavelangth 4000 Å is incident on a barium emitter , emitted photo electrons in a transverse magnetic field strength B = 5.2 xx 10^(-6) T moves in a circular path . Find the radius of the circle . Given work function of barium is 2.5 eV and mass of electron is 9.1 xx 10^(-31) kg . e = 1.6 xx 10^(-19) C , h = 6.6 xx 10^(34) Js .

When barium is irradiated by a light of lamda=4000A all the photoelectrons emitted are bent in a circle of radius 50 cm by a magnetic field of flux density 5.26xx10^(-6) T acting perpendicular to plane of emission of photoelectron. Then,

What is the strength of transverse magnetic field required to bend all the photoelectrons within a circle of a radius 50 cm when light of wavelength 3800 Å is incident on a barium emitter ? (Given that work function of barium is 2.5 eV, h=6.63xx10^(-34)js, e=1.6xx10^(19)C,m=9.1xx10^(-31)kg

Radiation falls on a target kept within a solenoid with 20 turns per cm, carrying a current 2.5 A. Electrons emitted move in a circle with a maximum radius of 1 cm. Find the wavelength of radiation, given that the work function of the target is 0.5 eV. q =1.6xx10^(-19)C , h = 6.625xx 10^(-34)J-s , mass of electron = 9.1 xx 10^(-31)kg

Photons of wavelength 6556 A^@ falls on a metal surface. If ejected electrons with maximum K.E. moves in magnetic field of 3 xx 10^(-4) T in circular orbit of radius 10^(-2) m, then work function of metal surface is

In a photocell bichromatic light of wavelength 2475 Å and 6000 Å are incident on cathode whose work function is 4.8 eV . If a uniform magnetic field of 3 xx 10^(-5) Tesla exists parallel to the plate , the radius of the path describe by the photoelectron will be (mass of electron = 9 xx 10^(-31) kg )

An electron of energy 1800 eV describes a circular path in magnetic field of flux density 0.4 T. The radius of path is (q = 1.6 xx 10^(-19) C, m_(e)=9.1 xx 10^(-31) kg)

Photo-electrons are produced from a metal surface using a radiation of wavelength 6561Å . These photo-electrons, when made to enter a uniform magnetic field of intensity 3 xx 10^(-4) T, move along different circular paths with a maximum radius of 10mm, then the work function of the metal is close to

AAKASH SERIES-DUAL NATURE OF RADIATION AND MATTER-PRACTICE EXERCISEX
  1. Light of wavelength 2475 Å is incident on barium . Photo electrons emi...

    Text Solution

    |

  2. Two separate monochromatic light beams A and B of the same intensity (...

    Text Solution

    |

  3. The maximum kinetic energy of an electron is E when the incident wavel...

    Text Solution

    |

  4. Two sources A and B have same power . The wavelength of radiation of A...

    Text Solution

    |

  5. The photo electric threshold wavelength for a metal is 2750A^(@), The ...

    Text Solution

    |

  6. When the incident wavelengths are lamda and lamda//2 the kinetic energ...

    Text Solution

    |

  7. A 1 kw radio transmitter operates at a frequency of 880 KHz how many p...

    Text Solution

    |

  8. The threshold wavelength for photo electric emission from a material i...

    Text Solution

    |

  9. Light of wavelength 4000A∘ is incident on a metal surface. The maximum...

    Text Solution

    |

  10. Monochromatic light incident on a metal surface emits electrons with k...

    Text Solution

    |

  11. Three metals have work functions in the ratio 2 3:4. Graphs are drawn ...

    Text Solution

    |

  12. Two photons of energies twice and thrice the work function of a metal ...

    Text Solution

    |

  13. The work function of substance is 4.0 eV. The longest wavelength of li...

    Text Solution

    |

  14. Photoelectric work function of a metal is 1eV, light of wavelength lam...

    Text Solution

    |

  15. When a monochromatic point source of light is at a distance of 0.2 m...

    Text Solution

    |

  16. The work function of a substance is 12.4 eV. The longest wavelength of...

    Text Solution

    |

  17. A surface irradiated with light of wavelength 480 nm gives out electro...

    Text Solution

    |

  18. What P.D. must be applied to stop the fastest photo electron emitted b...

    Text Solution

    |

  19. The threshold frequency for photo electric effect for a metal surface ...

    Text Solution

    |

  20. The work functions of metals A and B are in the ratio 1 : 2. If light ...

    Text Solution

    |

  21. When a metal surface is illuminated by light of wavelengths 400 nm and...

    Text Solution

    |