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The mass of an alpha-particle is....

The mass of an `alpha-`particle is.

A

Less than the sum of masses of two protons and two neutrons

B

Equal to mass of four protons

C

Equal to mass of four neutrons.

D

Equal to sum of masses of two protons and two neutrons

Text Solution

Verified by Experts

The correct Answer is:
A
(a) This is due to mass defect because a part of mass is used in keeping the neutrons and protons bound as `alpha-`particle.
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Knowledge Check

  • A fusion reaction consists of combining four protons into an alpha -particle the mass of alpha - particle is 4.00260u and that of proton is 1.007825u

    A
    the equation `4p_(1)^(1)toHe_(2)^(4)` does not satisfy conservation of charge
    B
    the correct reaction equation may be `4p_(1)^(1)toHe_(2)^(4)+2beta^(+)+2upsilon` where `beta^(+)` is positron and `upsilon` is the neutrino (zero rest mass and uncharged)
    C
    loss of mass in the reaction is 0.028697 u
    D
    the energy equivalent of the mass defect is 26.7 MeV

  • A beam of alpha paricles is incident on a target of lead. A particular alpha paticles comes in 'head- on' to a particular lead nucleus and stops 6.50 xx 10^(-14) m away from the center of the nucleus. (This point is well outside the nucleus.) Assume that the lead nucleus, which has 82 protons, remains at rest. The mass of alpha particle is 6.64 xx 10^(-27)kg What initial kinetic energy (in joule and in MeV)did the alpha particle have?

    A
    `36.3`
    B
    `0.36`
    C
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  • A beam of alpha paricles is incident on a target of lead. A particular alpha paticles comes in 'head- on' to a particular lead nucleus and stops 6.50 xx 10^(-14) m away from the center of the nucleus. (This point is well outside the nucleus.) Assume that the lead nucleus, which has 82 protons, remains at rest. The mass of alpha particle is 6.64 xx 10^(-27)kg What was the initial speed of the alpha particle?

    A
    `132. xx 10^(2) m s^(-1)`
    B
    `1.32. xx 10^(7) m s^(-1)`
    C
    `13.2. xx 10^(2) m s^(-1)`
    D
    `0.13. xx 10^(7) m s^(-1)`

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