Home
Class 12
PHYSICS
A cathode emits 1.8xx10^(17) electron pe...

A cathode emits `1.8xx10^(17)` electron per second and all the electrons reach the anode when it Is given a positive potential of `400V`. Given `e=1.6xx10^(-19)`C, the maximum anode current is .

A

`2.88mA`

B

`28.8mA`

C

`7.2mA`

D

`6.4mA`

Text Solution

Verified by Experts

The correct Answer is:
B
`i=("ne")/t`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ATOMIC PHYSICS

    NARAYNA|Exercise LEVEL-II (H.W)|14 Videos

  • ATOMIC PHYSICS

    NARAYNA|Exercise LEVEL-VI|55 Videos

  • ALTERNATING CURRENT

    NARAYNA|Exercise LEVEL - II(H.W)|13 Videos

  • ATOMS

    NARAYNA|Exercise EXERCISE -4|47 Videos

Similar Questions

Explore conceptually related problems

An electron gun emits 2.0xx10^(16) electrons per second. What is the associated current ?

An electric gum emits 2.0xx10^(16) electrons per second. What electric current does this correspond to ?

Knowledge Check

  • The cathode its 8 xx 10^(14) electrons per second, when heated. When 400 V is applied to anode all the emitted electrons reach the anode. The charge on electron is 1.6 xx 10^(-19)C . The maximum anode current is

    A
    `2.7 muA`
    B
    `128 muA`
    C
    `72 muA`
    D
    `29 muA`

  • A metal wire of cross-sectional area 1m m^(2) contains 5xx10^(22) electrons per cm^(3) . If the electrons move along the wire with average drift velocity 1m m//s , then the current in the wire is ( e=1.6xx10^(-19)C )

    A
    8A
    B
    4A
    C
    2A
    D
    1A

  • 14xx10^(15) electrons reach the anode per second. If the power consumed is 448 milliwatts, then the plate (anode) voltage is

    A
    150 V
    B
    200 V
    C
    `14xx448 V`
    D
    `448//14 V`

    • Similar Questions

    Explore conceptually related problems

    How many electrons pass through a bulb in 1 min, if the current is 400 mA. (e=1.6xx10^(-19)C) ?

    How many electrons flow through the filament of a 120V and 60W electric lamp per second? Given e=1.6xx10^(-19)C .

    How many electrons flow through the filament of a 120V and 60W electric lamp per second? Given e=1.6xx10^(-19)C .

    An electron is liberated from a hot filament and attracted by an anode at 1200 V. What is its speed when it strike the anode?(e= 1.6xx10^(-19) C)

    The number of electrons delivered at the cathode in electrolysis by a current of 1 ampere in 60 seconds on electron =1.60 xx 10^(-19) C

    Home
    Profile