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Positron is the antiparticle of an elect...

Positron is the antiparticle of an electron .It has the same mass as an electron but the opposite charge An electron and a positron moving towards each other with equal and opposite velocities.

A

can annihilate into one photon. Conserving both energy and momentum

B

cannot annihilate into one photon because energy cannot be conserved

C

cannot annihilate into one photon because momentum cannot be conserved

D

cannot annihilate into one photon because charge cannot be conserved

Text Solution

Verified by Experts

The correct Answer is:
C
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The positron is a fundamental particle with the same mass as that of the electron and with a charge equal to that of an electron but of opposite sign. When a positron and an electron collide, they may annihilate each other. The energy corresponding to their mass appears in two photons of equal energy. Find the wavelength of the radiation emitted. [Take : mass of electron = (0.5//c^(2))MeV and hc = 1.2 xx 10^(-12) MeV-m , where h is the Planck's constant and c is the velocity of light in air.

Knowledge Check

  • Which of the following has the same mass as that of an electron ?

    A
    Photon
    B
    Neutron
    C
    Positron
    D
    Proton

  • Positron has nearly the same mass as that of:

    A
    `alpha`-particle
    B
    Proton
    C
    Neutron
    D
    Electron

  • Positronium consists of an electron and a positron (a particle which has the same mass as an electron , but opposite charge ) orbiting round their common centre of mass. Calculate the value of the Rydberg constant for this system

    A
    `R_oo //4`
    B
    `R_oo //2`
    C
    `2R_oo`
    D
    `R_oo`

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