Particle accelerators and detectors Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Electrons are accelerated from rest through 400 V. Their kinetic energy is
- A. 6.4 × 10⁻¹⁷ J
- B. 1.6 × 10⁻¹⁹ J
- C. 400 J
- D. 2.6 × 10⁻²² J
2. A proton and an alpha particle have the same momentum and move perpendicular to the same magnetic field. The radius of the alpha particle's path is
- A. twice that of the proton
- B. the same as that of the proton
- C. one quarter that of the proton
- D. half that of the proton
3. In a cyclotron the alternating p.d. has a constant frequency because
- A. the speed of the protons is constant
- B. the time per semicircle does not depend on speed
- C. the radius of the path is constant
- D. the magnetic field alternates
4. Why do the drift tubes in a linac get longer?
- A. The p.d. increases
- B. The field inside the tubes increases
- C. The particles move faster, so travel further in each half-period
- D. The particles lose charge
5. A track in a detector spirals inwards. This is because the particle
- A. gains charge
- B. is neutral
- C. moves in a stronger field
- D. loses energy by ionisation, so its momentum falls