The energy levels for an atom are shown to scale. A photon of wavelength λ is emitted because of a transition from E3 to E2. Which transition leads to the emission of a photon of longer wavelength?

• A. E4 to E1

• B. E4 to E3

• C. E3 to E1

• D. E2 to E1

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A proton, an electron and an alpha particle are at rest. Which particle has the smallest magnitude of ratio of charge to mass and which particle has the largest magnitude of ratio of charge to mass?

• A

• B

• C

• D

X is a radioactive nuclide that decays to a stable nuclide. The activity of X falls to 1/16th of its original value in 32 s.What is the half-life of X?

• A. 2 s

• B. 4 s

• C. 8 s

• D. 16 s

Tags

NGSS.HS-PS1-8

What is correct about the nature and range of the strong interaction between nuclear particles?

• A. It is attractive at all particle separations.

• B. It is attractive for particle separations between 0.7 fm and 3 fm.

• C. It is repulsive for particle separations greater than 3 fm.

• D. It is repulsive at all particle separations.

Tags

NGSS.HS-PS1-8

Which property of a nuclide does not change as a result of beta decay?

• A. Nucleon number

• B. Neutron number

• C. Proton number

• D. Charge

Tags

NGSS.HS-PS1-8

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Tags

NGSS.HS-PS1-8

Which of the following atomic energy level transitions corresponds to photons of the shortest wavelength?

• A

• B

• C

• D

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A radioactive nuclide with atomic number Z undergoes a process of beta-plus (β+) decay. What is the atomic number for the nuclide produced and what is another particle emitted during the decay?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-8

The positions of stable nuclei are plotted by neutron number n and proton number p. The graph indicates a dotted line for which n = p. Which graph shows the line of stable nuclides and the shaded region where unstable nuclei emit beta minus (β-) particles?

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Tags

NGSS.HS-PS1-8

Three conservation laws in nuclear reactions are

I. conservation of charge

II. conservation of baryon number

III. conservation of lepton number.

The reaction (in the attached image) is proposed.Which conservation laws are violated in the proposed reaction?

• A. I and II only

• B. I and III only

• C. II and III only

• D. I, II and III

Tags

NGSS.HS-PS1-8