Energy, mass and antimatter 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. What is the mass, in kg, of a particle of mass 1.0 GeV/c²?
- A. 1.8 × 10⁻³⁶ kg
- B. 5.3 × 10⁻¹⁹ kg
- C. 1.8 × 10⁻²⁷ kg
- D. 1.6 × 10⁻²⁸ kg
2. Why can a single photon not create an electron–positron pair in empty space?
- A. Momentum could not be conserved
- B. Charge could not be conserved
- C. Its energy would be too low whatever its frequency
- D. Photons have no rest energy to convert
3. Why are very high-energy electrons used to study the structure of a proton?
- A. Their charge is larger
- B. They are not deflected by the proton
- C. They have more mass at high energy so they hit harder
- D. Their de Broglie wavelength is very short
4. A charged particle in a bubble chamber leaves a track that spirals inwards. What is the cause?
- A. It gains charge as it travels
- B. It loses energy, so its momentum and track radius decrease
- C. The magnetic field strength increases
- D. It is accelerated by the chamber liquid
5. For which muon speed is the relativistic increase in lifetime most significant?
- A. 3 m s⁻¹
- B. 300 m s⁻¹
- C. 0.99c
- D. 3 × 10⁴ m s⁻¹