Pentaquarks

Question Results

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Question:

Which are the elementary particles inside protons and neutrons?

Response:

	Pions
	Quarks and gluons
	Muons
	Neutrinos

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Question:

Which are the valence quarks inside a proton?

Response:

	Three down quarks
	Strange quarks
	Two down and one up-quark
	Two up and one down-quark

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Question:

Which is the force that holds nuclei together?

Response:

	Strong force
	Electroweak force
	Gravity
	Electromagnetism

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Question:

Why is it difficult to detect exotic particles such as pentaquarks?

Response:

	Because they do not exist
	Because they do not interact with ordinary matter
	Because they are neutral
	Because they are rare and short-lived