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The rest mass energy of an electron positron pair is?
Twice the mass of the electron, since the positron has the same mass of the electron. Or the equivalent, in energy units.An electron has a mass or energy of 511 keV.
How is a positron different from an electron?
A positron is an electron's antiparticle. It has the same mass as an electron, but an opposite electrical charge.
What is A subatomic particle that has no charge and very small mass is called?
Positron
Which type of radiation has a negligible mass and a charge of plus 1?
This is a positron.
What is the mass number of a positron?
The mass of a positron is approximately 9.1093826(16) × 10−31 kg. The positron and the electron are anti-particles of each other, and you can find out more about the positron at the Wikipedia article on that subject. A link to their post can be found below. There is also a link to a related question on the nature of the positron. That's down there, too.
When radioactive phosphorus decay it emits a positron will the resulting nucleus be another isotope of phosphorus?
No, whenever an atom emits a positron its atomic number is decreases by one unit (because a proton is converted into a neutron and a positron) but atomic mass remains the same so phosphorus is converted into silicon atom with same atomic mass.
Why isn't electron and positron mass equal?
Their masses are equal. It's their charges that are opposite.
Are the rest mass of the positron and the electron exactly equal?
Yes; they simply have opposite charges.
What is the change in atomic number when an atom emits a positron?
Emitting a positron, turns a proton into a neutron. So the atomic number goes down by 1, while the mass number remains the same.
What is a particle with a positive chatge?
A beta particle is an electron, and electrons are negative. You're probably thinking of a positron, which has the same mass as an electron but the opposite charge.
What radionuclide decays to Br-73 by positron emission?
Work backwards. Positron emission means (essentially) a proton decayed into a neutron/positron pair. The mass number remains the same, but the atomic number goes down one to Bromine. Krypton has an isotope that fits this bill.
What decay decreases atomic mass by 1?
Beta with a decay of a positron (as opposed to the more common electron).
