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Engineering Exams RRB-JE CMA (Chemical and Metallurgical Assistant) Technical Abilities 2025 22.04.25 Paper-2 Shift-2 Easy +1 -0.33
Which of the following is equivalent to the energy of 1.602 × 10−20 J?
Correct Answer: C. 0.1 eV
Explanation: To determine which energy level is equivalent to 1.602 × 10−20 J, we use the conversion factor between Joules and electronvolts (eV). One electronvolt is defined as the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt, which is approximately 1.602 × 10−19 J. By dividing the given value (1.602 × 10−20 J) by the value of 1 eV (1.602 × 10−19 J), we get 0.1. Therefore, 1.602 × 10−20 J is equivalent to 0.1 eV.
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