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A proton and an alpha- particle, having ...

A proton and an `alpha`- particle, having kinetic energies `K_P and K_a` respectively enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of `alpha-` particle is 2:1. The ratio of `K_p : K_a` is :

A

`1:8`

B

`8:1`

C

`1:4`

D

`4:1`

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Knowledge Check

  • The ratio of specific charge of a proton and an alpha -particle is

    A
    `2:1`
    B
    `1:2`
    C
    `1:4`
    D
    `1:1`

  • The ratio of the e/m values of a proton and an alpha -particle is:

    A
    `2:1`
    B
    `1:1`
    C
    `1:2`
    D
    `1:4`

  • A proton, a deuteron and alpha - particle with the same kinetic energy enter a region of uniform magetic field moving a angle to B. What is the ratio of the radii of their path ?

    A
    `1 : sqrt(2) : 1`
    B
    `1 : sqrt(2) : sqrt(2)`
    C
    `sqrt(2) : 1 : 1`
    D
    `sqrt(2) : sqrt(2) : 1`

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