An Electron and a Positron (Antielectron), Both Nearly at Rest

question 23

Multiple Choice

An electron and a positron (antielectron) , both nearly at rest, collide. What particle(s) is(are) produced?

• A) One photon of energy 1.02 MeV
• B) Two photons of energy 511 keV
• C) A pi-meson
• D) A K-meson and an anti-neutrino

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Definitions:

Olfactory Neurons

Sensory cells located in the nasal cavity that are responsible for the detection of odor molecules, leading to the sense of smell.

Human Olfactory System

Pertains to the bodily structures and processes involved in the sense of smell in humans.

Olfactory Epithelium

Two 1-square-inch patches of tissue, one at the top of each nasal cavity, which together contain about 10 million olfactory neurons, the receptors for smell.

Taste Receptors

Specialized cells located on the tongue that enable the perception of different tastes, such as sweet, sour, salty, bitter, and umami.