Physics
The energy of electron is 2.5 eV. When expressed in Joule, it is
- 1.6 x 10-19 J
- 4.0 x 10-19 J
- 3.2 x 10-19 J
- 0
Work, Energy & Power
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Answer
4.0 x 10-19 J
Reason — Given, energy of electron = 2.5 eV
1 eV = 1.6 x 10 -19 J
Hence,
2.5 eV = 2.5 x 1.6 x 10 -19 = 4 x 10 -19 J
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