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Nuclear and Particle Physics MCQs — Physics (page 14)

330 multiple-choice questions on Nuclear and Particle Physics from Physics, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

326. A proton is accelerated through a p.d. of 2 10^9 V. The kinetic energy it gains is:

  1. 3.2 10^-10 J
  2. 1.6 10^-10 J
  3. 3.2 10^-9 J
  4. 6.4 10^-10 J

Answer: A) 3.2 10^-10 J

Explanation: KE = eV = 1.6 10^-19 2 10^9 = 3.2 10^-10 J. SLO P-11-F-23 · Understanding

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327. In annihilation, energy and momentum are conserved, and the energy appears as:

  1. nothing
  2. heat and light (photons) or new particles
  3. chemical energy
  4. gravitational energy only

Answer: B) heat and light (photons) or new particles

Explanation: As in the SLO. SLO P-11-F-28 · Understanding

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328. Proton–antiproton annihilation typically produces:

  1. a single photon only
  2. two electrons
  3. several pions
  4. a neutron

Answer: C) several pions

Explanation: Mass partly goes into new particles. SLO P-11-F-28 · Understanding

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329. Charm and top quarks have charge:

  1. 0
  2. + 23e
  3. - 13e
  4. +e

Answer: B) + 23e

Explanation: Same as up. SLO P-11-F-12 · Understanding

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330. Gamma rays in a magnetic field are:

  1. deflected like beta
  2. stopped
  3. deflected like alpha
  4. not deflected

Answer: D) not deflected

Explanation: No charge. SLO P-11-F-08 · Understanding

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