Photons and the electron combined

Multiple Choice

What did Albert Einstein propose about electromagnetic radiation around 1905?

• It behaves only as a wave.

• It can be considered a stream of particles called photons.

• It has no energy.

• It cannot travel through a vacuum.

Multiple Choice

Which formula is used to calculate the energy of a photon?

• E_photon = h * c / λ

• E_photon = m * v^2

• E_photon = q * V

• E_photon = F * d

Multiple Choice

Which equation represents the relationship between the energy of a photon, Planck's constant, the speed of light, and the wavelength of light?

• E_photon = h * c / λ

• E_photon = m * c^2

• E_photon = h * λ / c

• E_photon = c / (h * λ)

Multiple Choice

According to the formula shown, what does the energy of a photon depend on?

• The speed of light and Planck's constant

• The wavelength of the photon

• The mass of the photon

• The temperature of the source

Open Ended

Summarize the dual nature of light as described in the Properties of Light Summary.

Fill in the Blanks

The energy of each photon can be calculated using the formula E_photon =

* c / λ.

Multiple Choice

How does Einstein's Special Theory of Relativity suggest that photons might have mass?

• Because photons travel at the speed of light

• Because energy can be converted to mass according to E = mc^2

• Because photons have charge

• Because photons are particles of matter

Fill in the Blanks

The wavelength of light emitted when an electron falls from n=3 to n=2 in a hydrogen atom is

nm.

Multiple Choice

Which formula is used to calculate the energy of a photon?

• E = h * c / λ

• E = m * c^2

• E = q * V

• E = 1/2 * m * v^2

Multiple Select

Which of the following statements about electrons is/are correct?

• Electrons have a charge of -1.

• Electrons have a spin of 1/2.

• Electrons have a large mass.

• Electrons are responsible for the chemical properties of atoms.

Open Ended

Explain the photoelectric effect and the role of photons in this phenomenon.

Fill in the Blanks

The equation E = m *

^2 relates energy and mass in Einstein's special theory of relativity.

Multiple Choice

According to Niels Bohr's model, what happens to an electron in a hydrogen atom when it is given excess energy?

• It jumps to a higher energy level

• It leaves the atom completely

• It merges with the nucleus

• It splits into two electrons

Multiple Select

Which of the following statements are true about photons and electromagnetic radiation?

• Photons are particles of electromagnetic energy.

• Electromagnetic radiation has both wave and particle properties.

• Photons always have mass.

• Energy occurs in specific packets called quanta.

Fill in the Blanks

Scientists use the letter

to refer to the number of the energy level in a hydrogen atom.

Open Ended

Describe the process that occurs when an electron in a hydrogen atom returns from an excited state to its ground state. What is emitted during this process?

Multiple Select

Which of the following statements about the emission of light photons by hydrogen atoms are correct?

• Light photons are emitted when electrons jump to lower energy levels

• The wavelength of emitted photons depends on the energy difference between levels

• Electrons emit photons when they move to higher energy levels

• All emitted photons have the same wavelength

Open Ended

Calculate the energy change required to excite a hydrogen electron from level n=1 to level n=2. Also, calculate the wavelength of light that would be emitted when the electron returns to n=1.

Open Ended

Explain the significance of the variable 'n' in the formula for the energy of a hydrogen atom's energy level.

Multiple Choice

What is the formula for the energy of an energy level of a hydrogen atom?

• E = -2.178 x 10^-18 J * (Z^2 / n^2)

• E = mc^2

• E = hν

• E = 1/2 mv^2

Fill in the Blanks

The energy change (ΔE) when an electron moves from n=2 to n=1 in a hydrogen atom is

x 10^-18 J.

Open Ended

How can scientists create an atomic spectrum for an element?

Multiple Select

Which of the following steps are necessary to calculate the wavelength of light emitted when an electron returns to n=1 in a hydrogen atom?

• Calculate the energy at each level

• Find the energy change by subtracting the initial from the final energy state

• Use the energy of the photon equation to calculate the wavelength

• Multiply the energy by the speed of light

Open Ended

How would you explain the significance of the formula E_photon = (h * c) / λ in understanding the nature of light?

Multiple Choice

What did Albert Einstein propose about electromagnetic radiation around 1905?

• It can be considered as a stream of particles called photons.

• It is always a continuous wave.

• It is only visible light.

• It cannot interact with matter.

Open Ended

Describe how the energy and wavelength of light emitted by a hydrogen atom are related when an electron transitions from a higher to a lower energy level.