Which one of the following has the same mass as that of electron:
Which one of the following has the same mass as that of electron:
- hydrogen atom
- positron
- neutron
- proton
The Correct Option is B
Solution and Explanation
The positron has same mass \(9.1\times {{10}^{-31}}kg\) as that of electron. The magnitude of charge in both electron and positron is \(1.6\times {{10}^{-19}}C\) .
Positron, which is a subatomic particle and is referred to as the antimatter counterpart of an electron. The mass of a positron is equal to that of an electron but has a positive electric charge. They have the properties that are opposite to that of the electrons. When an electron and positron encounter each other they release energy in the form of gamma rays. It is used in medical imaging.
so, the correct answer is (B): positron
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Concepts Used:
Nuclear Physics
Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter. Nuclear physics should not be confused with atomic physics, which studies the atom as a whole, including its electrons
Radius of Nucleus
‘R’ represents the radius of the nucleus. R = RoA1/3
Where,
- Ro is the proportionality constant
- A is the mass number of the element
Total Number of Protons and Neutrons in a Nucleus
The mass number (A), also known as the nucleon number, is the total number of neutrons and protons in a nucleus.
A = Z + N
Where, N is the neutron number, A is the mass number, Z is the proton number
Mass Defect
Mass defect is the difference between the sum of masses of the nucleons (neutrons + protons) constituting a nucleus and the rest mass of the nucleus and is given as:
Δm = Zmp + (A - Z) mn - M
Where Z = atomic number, A = mass number, mp = mass of 1 proton, mn = mass of 1 neutron and M = mass of nucleus.
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