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When accelerated along a straight line a...

When accelerated along a straight line at `2.8xx10^(15)m//s^(2)` in a machine, an electron ( mass `m=9.1xx10^(-31)kg`) has an initial speed of `1.4xx10^(7)` m/s and travels 5.8 cm. Find (a) the final speed of the electron and (b) the increase in its kinetic energy.

Text Solution

Verified by Experts

The correct Answer is:
(a) `2.3xx10^(7)m//s; (b) 1.5xx10^(-16)J`
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Knowledge Check

  • An electron of mass 9xx10^(-31) Kg movie with a speed pf 10^(7)m//s . It acquires a K.E of (in eV)

    A
    `562.50`
    B
    `1125`
    C
    `1250`
    D
    `281.25`

  • The rest mass of an electron is 9.1 xx10^(-31) kg. Its kinetic energy when it moves with a speed of 2.4xx10^(8) m/s is

    A
    `5.45xx10^(-14) J`
    B
    `54.36xx10^(-14) J`
    C
    `56.43xx10^(-14) J`
    D
    `53.46xx10^(-14)J`

  • The mass of an electron at rest is 9.1 xx10^(-31) kg. The energy of electron when it moves with speed of 1.8xx10^(8) m/s is

    A
    `2xx10^(-13)J`
    B
    `1xx10^(13)J`
    C
    `1.29xx10^(-13)J`
    D
    `1xx10^(-3) J`

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