Home
Class 11
PHYSICS
If the ratio of the concentration of ele...

If the ratio of the concentration of electrons and that of holes in a semiconductor is 7/5 and the ratio of their currents is 7/4, then the ratio of their drift velocities is

A

`(5)/(8)`

B

`(4)/(5)`

C

`(5)/(4)`

D

`(4)/(7)`

Text Solution

Verified by Experts

The correct Answer is:
C
`I=n eAv_(d)rArrv_(d)prop(1)/(n)`
`(v_(d_(1)))/(v_(d_(2)))=(I_(1))/(I_(2))xx(n_(2))/(n_(1))=(7)/(4)xx(5)/(7)=(5)/(4)`
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTORS

    ALLEN|Exercise Part-3(Exercise-3)|27 Videos

  • PHYSICAL WORLD, UNITS AND DIMENSIONS & ERRORS IN MEASUREMENT

    ALLEN|Exercise EXERCISE-IV|8 Videos

  • WAVES AND OSCILLATIONS

    ALLEN|Exercise Part-1(Exercise-05)[B]|42 Videos

Similar Questions

Explore conceptually related problems

If the ratio of the concentration of electron to that of holes in a semiconductor is (7)/(5) and the ratio of current is (7)/(4) then what is the ratio of their drift velocities ?

If the mass ratio of O_2 and N_2 is 4:7 , then the ratio of their moles is

The ratio of the velocity of electron in 3rd and 5th orbit of hydrogen atom is

The ratio of the circumference of two circles is 4:5. Find the ratio of their radii.

Two wires of the same material but of different diameters carry the same current i . If the ratio of their diameters is 2:1 , then the corresponding ratio of their mean drift velocities will be

If the ratio of A to B is 3:5 and the ratio of B to C is 2:7, what is the ratio of A to C?

The ratio of volumes of two cones is 4:5 and the ratio of the radii of their bases is 2:3. Find the ratio of their vertical heights.

The ratio of 9 : 7 is due to:

Find the ratio : 7m to 17 m

When current is 4 A in a conductor the drift velocity is v_(d) . When the current is 3 A the drift velocity will be

ALLEN-SEMICONDUCTORS-Part-3(Exercise-4)
  1. In a common-base of mode of transistor, the collector current is 5.488...

    Text Solution

    |

  2. A solid which is not transperent to visible light and whose conductivi...

    Text Solution

    |

  3. If the ratio of the concentration of electrons and that of holes in a ...

    Text Solution

    |

  4. The circuit has two oppositely connected ideal diodes in parallel. Wha...

    Text Solution

    |

  5. In the following, which one of the diodes is reverse biased ?

    Text Solution

    |

  6. If the lattice constant of this semiconductor is decreased, then which...

    Text Solution

    |

  7. Carbon, silicon and germanium have four valence electrons each. At roo...

    Text Solution

    |

  8. If in a p-n junction, a square input signal of 10 V is applied as show...

    Text Solution

    |

  9. A working transitor with its three legs marked P, Q and R is tested us...

    Text Solution

    |

  10. In the circuit below, A and B represent two inputs and C represents th...

    Text Solution

    |

  11. A p -n junction (D) shown in the figure can act as a rectifier. An alt...

    Text Solution

    |

  12. The logic circuit shown below has the input waveforems 'A' and 'B' as ...

    Text Solution

    |

  13. The combination of gates shown below yields

    Text Solution

    |

  14. The question has statement - 1 and statement - 2 Of the four choices ...

    Text Solution

    |

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

    Text Solution

    |

  16. Which of following four alternatives is not correct? We need modulatio...

    Text Solution

    |

  17. Truth table for system of four NAND gates as shown in figure is

    Text Solution

    |

  18. A diode detector is used to detect an amplitude modulated wave of 60% ...

    Text Solution

    |

  19. The I - V characteristic of an LED is

    Text Solution

    |

  20. The forward biased diode connection among the following is

    Text Solution

    |