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Which is true about an electron- (a). re...

Which is true about an electron-
(a). rest mass of electron is `9.1xx10^(-28)g`
(b). mass of electron increases with the increase in velocity
(c). molar mass of electron is `5.48xx10^(-4)g//"mole"`
(d). `e//m` of electron is `1.7xx10^(8) "coulomb"//g`

A

Rest mass of electron is `9.1xx10^(-28) g`

B

Mass of electron increases with the increase in velocity

C

Molar mass of electron is `5.48xx10^(-4) g//mole`

D

`e//m` of electron is `1.7xx10^(8) coulomb//g`

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`m_(e)=9.1xx10^(-31)kg=9.1xx10^(-28) g`
`m=m_(0)/sqrt(1-v^(2)/c^(2)) (m_(0): "rest mass , m : dynamic mass")`
`As vuarr, (1-v^(2)/c^(2))darr :. m uarr`
Molar mass of `e=9.1xx10^(-28)xx6.023xx10^(23)=5.48xx10^(-4) g//`mole
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Knowledge Check

  • The rest mass of an electron is 9.11xx10^(-31) kg. Molar mass of the electron is

    A
    `1.5xx10^(-31) kg mol^(-1)`
    B
    `9.11xx10^(-31) kg mol^(-1)`
    C
    `5.5xx10^(-7) kg mol^(-1)`
    D
    `6.02xx10^(23) kg mol^(-1)`

  • If mass of an electron is 9.1xx10^(-31) kg, the number of electrons in 1 mg is

    A
    `1.09xx10^(27)`
    B
    `1.09xx10^(24)`
    C
    `9.1xx10^(28)`
    D
    `9.1xx10^(31)`

  • If the mass of an electron is 9 xx 10^(-28) grams weight of one mole of electron is

    A
    `9 xx 10^(-28)gm`
    B
    `6 xx 10^(-28)`
    C
    `1.008 gm`
    D
    `0.00054 gm`