Science
MediumQ. No. what-is-the-approximate-mass-of-an-electron
What is the approximate mass of an electron?
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A9.1 × 10⁻²⁸ kg
B1.67 × 10⁻²⁷ kg
C1.67 × 10⁻³¹ kg
D9.1 × 10⁻³¹ kg
Correct Answer: 9.1 × 10⁻³¹ kgYour Answer: D
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The correct answer is Option D — 9.1 × 10⁻³¹ kg. The electron is the lightest of the three fundamental subatomic particles (electron, proton, neutron). Its mass is approximately 9.1 × 10⁻³¹ kg (more precisely 9.10938 × 10⁻³¹ kg). This is a fundamental constant in physics used extensively in atomic and nuclear calculations.
Why other options are wrong:
Option A (9.1 × 10⁻²⁸ kg): This is not the correct value for electron mass. It is 1000 times larger than the actual electron mass.
Option B (1.67 × 10⁻²⁷ kg): This is the mass of a PROTON, not an electron. The proton is about 1836 times heavier than the electron.
Option C (1.67 × 10⁻³¹ kg): This is an incorrect value. While the exponent (-31) is correct, the coefficient 1.67 belongs to the proton/neutron mass.
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