How Was the Positron Discovered

question 64

Multiple Choice

How was the positron discovered?

• A) By creating them in very high energy collisions of heavy nuclei such as gold nuclei.
• B) By observing the cloud chamber tracks of high energy gamma rays as they created positron- electron pairs.
• C) By observing the cloud chamber tracks of cosmic rays as they passed through a metal plate.
• D) By allowing protons to collide in a particle accelerator.
• E) By allowing electrons to collide in a particle accelerator.

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Definitions:

Small

Of a size that is less than normal or usual.

Osteoclasis

The surgical breaking of a bone to correct a deformity.

Break

A pause or interval for rest or to interrupt a continuity.

Cyanotic

A condition marked by a bluish or purplish discoloration of the skin and mucous membranes due to insufficient oxygenation of the blood.