Modern Physics #2

The lowest energy state of an atom is called its:

• ground state

• ionized state

• initial energy state

• final energy state

Which electron transition in the hydrogen atom results in the emission of a photon with the greatest energy?

• n = 2 to n = 1

• n = 3 to n = 2

• n = 4 to n = 2

• n = 5 to n = 3

Tags

NGSS.HS-PS4-3

What is the minimum energy required to ionize a hydrogen atom in the n = 3 state?

• 13.60 eV

• 12.09 eV

• 5.52 eV

• 1.51 eV

Which photon energy could be absorbed by a hydrogen atom that is in the n = 2 state?

• 0.66 eV

• 1.51 eV

• 1.89 eV

• 2.40 eV

Answer explanation

remember, an electron can only land on an energy level, not in between

An electron in a mercury atom jumps from level a to level g by absorbing a single photon. Determine the energy of the photon in joules.

Mathematical Equivalence

ON

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

A photon having an energy of 9.40 electronvolts strikes a hydrogen atom in the ground state. Why is the photon not absorbed by the hydrogen atom?

• The atom’s orbital electron is moving too fast.

• The photon striking the atom is moving too fast.

• The photon’s energy is too small.

• The photon is being repelled by electrostatic force.

Tags

NGSS.HS-PS4-3

Which transition between the energy levels of a mercury atom causes the emission of a photon of highest frequency?

• e to d

• c to b

• c to a

• b to a

Tags

NGSS.HS-PS4-1

An electron in a mercury atom changes from energy level b to level e. This energy-level change occurs as the atom

• absorbs a 2.03-eV photon

• absorbs a 5.74-eV photon

• emits a 2.03-eV photon

• emits a 5.74-eV photon

Tags

NGSS.HS-PS4-3

• eV

• meters

• Hz

• Joules

Tags

NGSS.HS-PS4-3

A hydrogen atom emits a 2.55 electronvolt photon as its electron changes from one energy level to another. Calculate the frequency of the emitted photon.

Mathematical Equivalence

ON

Tags

NGSS.HS-PS4-1