Home
Class 12
PHYSICS
The forbidden energy gap in Ge in 0.72 e...

The forbidden energy gap in Ge in 0.72 eV Given, `hc=12400" eV"-Å` The maximum wavelength of radiation that will generate electron hole pair is

A

`172220Å`

B

`172.2Å`

C

`17222Å`

D

`1722Å`

Text Solution

Verified by Experts

The correct Answer is:
C
Energy gap , `E_g=(hc)/lamda`
`lamda=(hc)/E_g=(12400)/(0.72)=17222Å`
Promotional Banner

Topper's Solved these Questions

  • SOLIDS & SEMICONDUCTOR DEVICES

    MODERN PUBLICATION|Exercise Revision Test|28 Videos

  • SOLIDS & SEMICONDUCTOR DEVICES

    MODERN PUBLICATION|Exercise Multiple Choice Questions - LEVEL -III (Questions From AIEEE/JEE Examination)|9 Videos

  • ROTATIONAL MOTION

    MODERN PUBLICATION|Exercise RCQ|8 Videos

  • TRANSFERENCE OF HEAT

    MODERN PUBLICATION|Exercise Recent Competitive Questions|4 Videos

Similar Questions

Explore conceptually related problems

Find the de-Broglie wavelength of an electron with kinetic energy of 120 eV.

when a certain energy is applied to an hydrogen atom, an electron jumps from n =1 to n = 3 state. Find (i) the energy absorbed by the electron. (ii) wavelength of radiation emitted when the electron jump back to its initial state. ( Energy of electron in first orbit = - 13.6 eV , Planck's constant = 6.6225 xx10^(-34) Js, Charge on electron = 1.6 xx10^(-19) C, speed of light in vacuum = 3xx10^(8)ms^(-1)

The forbidden gap within germanium and silicon are 0.7 eV and 1.1 eV respectively. It implies that

In a hydrogen atom, the electron and proton are bound at a distance of about 0.53 Å (a) Estimate the potential energy of the system in eV, taking the zero of the potential energy at infinite separation of the electron from proton. (b) What is the minimum work required to free the electron, given that its kinetic energy in the orbit is half the magnitude of potential energy obtained in (a)? (c) What are the answers to (a) and (b) above if the zero of potential energy is taken at 1.06 Å separation?

The ground state energy of hydrogen atom is - 13.6 eV. If an electron makes a transition from an energy level - 0.85 eV to -3.4 eV, calculate the wavelength of the spectral line emitted. To which series of hydrogen spectrum does this wavelength belong?

If the total energy of anelectron in a hydrogen like atom in excited state is -3.4eV ,then the de Broglie wavelength of the electron is

MODERN PUBLICATION-SOLIDS & SEMICONDUCTOR DEVICES-Recent Competitive Questions
  1. The forbidden energy gap in Ge in 0.72 eV Given, hc=12400" eV"-Å The m...

    Text Solution

    |

  2. In a p - n junction diode , not connected to any circuit

    Text Solution

    |

  3. Identify the logic operation performed by the circuit given here

    Text Solution

    |

  4. An n-p-n transistor can be considered to be equivalent to two diodes, ...

    Text Solution

    |

  5. In the case of forward biasing of a p - n junction diode, which one of...

    Text Solution

    |

  6. The output of given logic circuit is :

    Text Solution

    |

  7. Copper and Germanium are cooled from room temperature to 100 K . Then ...

    Text Solution

    |

  8. For a transistor , beta = 100 . The value of alpha is

    Text Solution

    |

  9. The following truth table with A and B as inputs is for ………., gate .

    Text Solution

    |

  10. In which of the following statements, the obtained impure semiconducto...

    Text Solution

    |

  11. The width of the depletion region in a P-N junction diode is

    Text Solution

    |

  12. When the transistor is used as an amplifier

    Text Solution

    |

  13. Which one of the following is not correct?

    Text Solution

    |

  14. The output of an OR gate is connected to both the inputs of a NAND gat...

    Text Solution

    |

  15. in n type semiconductor, electrons are majority charge carriers but do...

    Text Solution

    |

  16. For the gives digital circuit write the truth table and identify the l...

    Text Solution

    |

  17. If alpha-current gain of a transistor is 0.98 . What is the value of ...

    Text Solution

    |

  18. The circuit has two oppositely connected ideal diodes in parallel . Wh...

    Text Solution

    |

  19. An LED is constructed from a pn junction based on a certain semi-condu...

    Text Solution

    |

  20. The given table is for {:("Input","Output"),(A" "B,Y),("0 0",...

    Text Solution

    |