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.
Last updated
Practise Electronics and Devices
758 free Electronics and Devices MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1 db corresponds to_____________change in power level?
A 1,000 V power supply would use_____________ as a filter capacitor?
A 10 V power supply would use ____________ as filter capacitor?
A 2-transistor class B power amplifier is commonly called ______________ amplifier?
A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?