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The rest mass energy of electron is...

The rest mass energy of electron is

A

1 eV

B

0.51 eV

C

0.051 MeV

D

5.1 MeV.

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Knowledge Check

  • The total energy of the electron in the hydrogen atom in the ground sate is -13.6 eV. The KE of this electron is

    A
    6.8 e V
    B
    0
    C
    `-13.6 eV`
    D
    13.6 e V

  • In the options given below, let E denote the rest mass energy of a nucleus and n a neutron. The correct option is:

    A
    `E(""_(92)^(236)U) gt E_(""_(53)^(137)I)+E (""_(39)^(97)Y)+2E(n)`
    B
    `E(""_(92)^(236)U) lt E_(""_(53)^(137)I)+E (""_(39)^(97)Y)+2E(n)`
    C
    `E(""_(92)^(236)U) lt E_(""_(56)^(140)Ba)+E (""_(36)^(94)Kr)+2E(n)`
    D
    `E(""_(92)^(236)U) = E_(""_(56)^(140)Ba)+E (""_(36)^(94)Kr)+2E(n)`

  • If an electron and a proton have the same de - Broglie wavelength , then the kinetic energy of the electron is

    A
    more than that of a proton
    B
    equal to that of a proton
    C
    zero
    D
    less than that of a proton

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