Home
Class 12
PHYSICS
An LED is constructed from a p-n junctio...

An LED is constructed from a p-n junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then, the wavelength of the emitted light is

A

1046 nm and red colour

B

654 nm and orange colour

C

1046 nm and blue colour

D

654 nm and red colour

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • JEE MAIN 2021

    JEE MAINS PREVIOUS YEAR|Exercise SECTION-B|40 Videos

  • JEE MAIN 2021

    JEE MAINS PREVIOUS YEAR|Exercise PHYSICS (SECTION-A)|20 Videos

  • JEE MAIN 2021

    JEE MAINS PREVIOUS YEAR|Exercise PHYSICS SECTION B|30 Videos

  • JEE MAIN

    JEE MAINS PREVIOUS YEAR|Exercise All Questions|473 Videos

  • JEE MAIN 2022

    JEE MAINS PREVIOUS YEAR|Exercise Question|492 Videos

Similar Questions

Explore conceptually related problems

A p-n junction is fabricated from a semiconductor with band gap of 2.8eV . Can it detect a wavelength of 6000nm ?

A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV can it detect a wavelength of 6000 nm

In a gas LED separation between valance band and conduction band is 1.9 eV . Then the light emitted is:

The ground state energy of an atom is -13.6eV . The photon emitted during the transition of electron from n=3 to n=1 state, is incidenet on a photosensitive material of unknown work function. The photoelectrons are emitted from the materials with a maximum kinetic energy of 9 eV. the threshold wavelength of the material used is

A p - n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Which of the following wavelengths it can detect?

JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-SECTION-A
  1. Consider the two insulating sheets with thermal resistance R(1) and R(...

    Text Solution

    |

  2. Given below are two statements : one is labelled as Assertion A and th...

    Text Solution

    |

  3. An LED is constructed from a p-n junction based on a certain semi-cond...

    Text Solution

    |

  4. If a number of little droplets of water, each of radius r, coalesce to...

    Text Solution

    |

  5. Five equal resistances are connected in a network as shown in figure. ...

    Text Solution

    |

  6. For extrinsic semiconductors, when doping level is increased,

    Text Solution

    |

  7. In a ferromagnetic material, below the curie temperature, a domain is ...

    Text Solution

    |

  8. 1 mole of an ideal gas in a cylindrical container have the P-V diagram...

    Text Solution

    |

  9. A stone is dropped from the top of a tower. When it crosses a point 5 ...

    Text Solution

    |

  10. Given below are two statements : Statement I : In a diatomic molecu...

    Text Solution

    |

  11. Two identical springs of spring constant '2k' are attached to a block ...

    Text Solution

    |

  12. If a message signal of frequency 'f(m)' is amplitude modulated with a ...

    Text Solution

    |

  13. A charge 'q' is placed at one corner of a cube as shown in figure.The ...

    Text Solution

    |

  14. The wavelength of the photon emitted by a hydrogen atom when an electr...

    Text Solution

    |

  15. An LCR circuit contains resistance of 110 Omega and a supply of 220 V ...

    Text Solution

    |

  16. A sphere of radius 'a' and mass 'm' rolls along a horizontal plane wit...

    Text Solution

    |

  17. An electron of mass m(e ) and a proton of mass m(p) = 1836 m(e ) are m...

    Text Solution

    |

  18. The displecement-time equation of a particle executing SHM is x = A si...

    Text Solution

    |

  19. If e is the electronic charge, c is the speed of light in free space a...

    Text Solution

    |

  20. An electron enters with kinetic energy KE1, between the plates of a ca...

    Text Solution

    |