Particle Accelerators: the Voltage Across the Dees of a Cyclotron

question 57

Multiple Choice

Particle accelerators: The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching a kinetic energy of 21 MeV? (1 eV = 1.60 × 10^-19 J, e = 1.60 × 10^-19 C, m_proton = 1.67 × 10^-27 kg)

• A) 2.0 million
• B) 1400
• C) 700
• D) 350
• E) 35

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Definitions:

N. Tinbergen

Nikolaas Tinbergen was a Dutch biologist and ornithologist who won the Nobel Prize in Physiology or Medicine for his discoveries concerning social behavior patterns in animals.

Altruistic Behavior

Behavior in which one individual helps another, seemingly at its own risk or expense.

Courtship Rituals

Behaviors intended to attract or maintain the attention of a potential mate. A courtship ritual may be a signal that triggers nest building, ovulation, or mating.

Dominance Hierarchy

A social structuring within a group of animals where individuals are ranked according to their access to resources, with a clear pecking order.