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alphaParticels are...

`alpha`Particels are

A

negatively charged particles

B

positively charged particles

C

neutral particles

D

positively charged particles having no mass.

Text Solution

Verified by Experts

The correct Answer is:
B
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Nuceli A and B convert into a stable nucleus C . Nucleus A is converted into C by emitting 2 alpha particels and 3 beta -particles. Nucleus B is converted into C by emitting one alpha -particle and 5 beta -particles. At time t=0 , nuclei of A are 4N_(0) and nuceli of B are N_(0) . Initially, number of nuclei of C are zero. Half-life of A (into conservation of C ) is 1 min and that of B is 2 min . Find the time (in minutes) at which rate of disintegration of A and B are equal.

(a) Write the expression for the magnetic force acting on a k charged particle moving with velocity v in the presence of magnetic field B . (b) A neutron an electron and an alpha particel moving with equal velocities enter a uniform magnetic field going into the plane of the paper as shown. Trace their paths in the field and justify your answer .

Knowledge Check

  • The velocity of alpha particels increases then angle of deviation

    A
    increases
    B
    decreases
    C
    remains same
    D
    Cannot be predicated

  • An alpha particel after passing through potential difference ofV volt collides with a nucleus. If the atomic number of the nucleus is Z , then distance of closest approach is

    A
    `14.4.(Z)/(V)`
    B
    `14.4(Z)/(V)m`
    C
    `14.4(V)/(Z)m`
    D
    `14.4(V)/(Z)`

  • A nucleus ._Z^AX emits an alpha -particel. The resultant nucleus emits a beta^(+) particle. The respective atomic and mass numbers of the final nucleus will be

    A
    `Z-3, A-4`
    B
    `Z-1,A-4`
    C
    `Z -2 , A-4`
    D
    `Z, A-2`

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    It is not possible to have a particel with charge 20xx10^(-19) C.

    Statement: Rutherfored studied the firest nuclear reaction: ._(7)^(14)N + ._(2)^(4)He rarr ._(8)^(17)O + ._(1)^(1)H + 1.193 MeV Explanation: alpha- particels lesser than energy 7.6 MeV were found ineffective.

    An alpha particel is projected with a velocity of 10^(7) m/s, in a unifform magnetic fiedl on inductin, 1.2xx10^(-6)Wb//m^(2), in a direction perpendicular to the field. If the lateral force acting on the particle is 3.84xx10^(-18)N, what is the charge onn the a particle ?

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    Select the correct styatement : (Only force on a particel is due to elctric field ) .

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