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Students are looking at trails in a cloud chamber and observe that suddenly trails appear, seemingly from nothing.
They cannot explain this since matter cannot be created.

Which of the following statements explains the appearance of particles?

A

Larger particles were shielding the original particles so that they could not be seen until that position.

B

A photon spontaneously creates a particle and an antiparticle when its energy is converted to mass.

C

The particles were there all the time, but they were too small to be seen until this moment. As they move through the cloud chamber, they grow like a snowball rolling down a hill until they are large enough to leave a trail.

D

Two positrons were created from energy in the cloud and the tracks are visible.

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