A particle having the mass of an electron and the charge of a proton is called a______________?
Correct answer: B. Positron
- A. Antiproton
- B. Positron
- C. Gamma rays
- D. Photon
Explanation
A positron is the antiparticle of the electron, so it has the electron's mass, 9.1 x 10^-31 kg, but the proton's positive charge, +1.6 x 10^-19 C. Students may choose antiproton because it is positively charged, but an antiproton has approximately the proton's mass, not the electron's mass.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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