Energy Level Calculations in Hydrogen Atoms

What does the energy level number 'n' represent in the context of hydrogen atoms?

• The number of protons in the atom

• The atomic mass of the atom

• The number of electrons in the atom

• The specific energy level of an electron

Why are the energy levels of electrons in atoms negative?

• Because energy is lost when electrons are attracted to protons

• Because electrons have negative charge

• Because energy levels are measured in negative units

• Because electrons are repelled by protons

What is the energy of the second energy level (n=2) in a hydrogen atom?

• -1.0 x 10^-19 Joules

• -5.445 x 10^-19 Joules

• -2.1 x 10^-18 Joules

• -8.712 x 10^-20 Joules

When an electron moves from a higher energy level to a lower one, what happens?

• The electron absorbs a photon

• The electron emits a photon

• The electron gains energy

• The electron remains at the same energy level

What is the energy difference when an electron transitions from n=5 to n=2 in a hydrogen atom?

• -5.445 x 10^-19 Joules

• -4.57 x 10^-19 Joules

• -2.1 x 10^-18 Joules

• -8.712 x 10^-20 Joules

How is the frequency of a photon related to its energy?

• Frequency is unrelated to energy

• Frequency is equal to energy

• Frequency is directly proportional to energy

• Frequency is inversely proportional to energy

What is the frequency of a photon emitted when an electron transitions from n=5 to n=2?

• 5.445 x 10^-19 Hz

• 8.712 x 10^-20 Hz

• 4.343 x 10^-7 Hz

• 6.903 x 10^14 Hz

What is the wavelength of a photon emitted during the transition from n=5 to n=2?

• 6.903 x 10^14 nm

• 434.3 nm

• 4.343 x 10^-7 nm

• 8.712 x 10^-20 nm

What happens to an electron when it absorbs a photon with sufficient energy?

• It emits another photon

• It moves to a higher energy level

• It remains in the same energy level

• It moves to a lower energy level

What is the significance of Planck's constant in photon energy calculations?

• It relates energy to wavelength

• It relates energy to mass

• It relates energy to frequency

• It relates energy to speed