A 25eV electron has a speed of______________?
Correct answer: B. 3 x 10^6m/sec
- A. 2 x 10^6m/sec
- B. 3 x 10^6m/sec
- C. 5 x 10^6m/sec
- D. 4 x 10^6m/sec
Explanation
Using ½mv² = 25 eV gives v = √(2E/m) ≈ 2.96 × 10⁶ m/s, which rounds to 3 × 10⁶ m/s. Therefore option b matches the calculated speed.
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