Question

Energy level diagrams

Question 1 options:

	Have the same form for all quantum systems.
	Show the quantum-mechanically available energies that a particle can have.
	Show the classically available energies that a particle can have.
	All of the above.
	I don't know.

Which of the following is not a type of beta-decay?

Question 2 options:

	The emission of an electron (and other stuff) from a nucleus
	The emission of an positron (and other stuff) from a nucleus
	The emission of a helium nucleus from a nucleus
	The absorption of an electron into a nucleus.
	All of the above are types of beta decay.

Question 3 (1 point)

Why could helium-3 never undergo alpha decay?

Question 4 options:

	There is not enough energy stored in the bonds of helium-3 to allow for alpha decay.
	There are not enough particles in a helium-3 nucleus to undergo alpha decay.
	Alpha decay requires mediation via neutrinos, which will not interact with a helium-3 nucleus.
	None of the above.
	I don't know.

Question 4(1 point)

If the half-life of a certain radioactive substance is 2 years, how much of the substance is left after 4 years?

Question 5 options:

	None of the substance is left.
	one-half
	one-third
	one-quarter
	one-sixth

Answer 1

(1) - Energy level diagrams show the quantum mechanically available energies that a particle can have.

(2)- The emission of helium nucleus from the nucleus is not a beta decay.

(3) -There are not enough particles in a helium-3 nucleus to undergo alpha decay.

(4)- one quarter substance will be left after 4 years.

Because after 2 years half will be decayed and in next 2 years half of half will be decayed.