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The mass of an electron is 9.1xx10^(-31)...

The mass of an electron is `9.1xx10^(-31)` kg and velocity is `2.99xx10^(10) cm s^(-1)`. The wavelenth of the electron will be

A

0.243 `"Å"`

B

0.0243 `"Å"`

C

4.21 `"Å"`

D

0.421 `"Å"`

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda=(h)/(mv)=(6.62xx10^(-34))/(9.1xx10^(-31)xx2.99xx10^(-8))`
0.024 `"Å"`
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Knowledge Check

  • The mass of an electron is 9.1xx10^-31 kg and its velocity is 812 me^-1 . calculate its wavelength.

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

  • 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
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    C
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    D
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