De Broglie Wavelength

What did Max Planck tell about light?

• Light travels in the form of small packets of energy called photons.

• Light travels in the form of small packets of energy called quanta.

• Light travels in the form of electromagnetic radiation.

• Light is made up of tiny particles called corpuscles.

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Multiple answers can be correct: Energy of light is proportional to:

• Directly proportional to frequency

• Inversely proportional to wavelength.

• Directly proportional to speed of light.

• Independant of speed and wavelength

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Which equation is used to calculate the wavelength associated with matter?

• c = λν

• λ = c/ν

• λ = h / mv

• λ = ch / E

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What do the different parts of the de Broglie equation (λ = h / mv) equal?

• h = Planck's constant, m = meters, v = frequency

• h = Planck's constant, m = meters, v = velocity

• h = Planck's constant, m = mass, v = frequency

• h = Planck's constant, m = mass, v = velocity

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How did the Heisenberg Uncertainty Principle affect the quantum mechanical model?

• You can't know the speed and position of the electron at the same time.

• You can know the speed and position of the electron at the same time.

• You can't know the mass and charge of an electron at the same time.

• You can't know the frequency and wavelength at the same time.

What does it mean to be "quantized"?

• The electron's mass is very small.

• The electron is actually a wave.

• The position & speed of the electron cannot be known at the same time.

• The electron is limited to certain positions in the atom because of specific, fixed energy levels.

The position & speed of the electron cannot be known at the same time.

• Planck

• Heisenberg

• de Broglie

• Schrodinger

How is wavelength of a moving object related to its mass?

• Heavier objects have smaller wavelengths.

• Smaller objects have smaller wavelengths.

• Larger objects have larger wavelengths.

• Smaller objects have larger wavelengths.

An unknown particle released from a Cepheid type II star is found to have a mass of 1.66 x 10^-28kg and a velocity near the speed of light. What is the wavelength of the particle?

• 7.56 x 10^-14 m

• 1.33 x 10^-14 m

• 2.55 x 10^-12 m

• 5.00 x 10^-18 m

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NGSS.HS-PS4-3

The de Broglie wavelength of an electron is 1.21 x 10^-2 nm. It is traveling at what percent of the speed of light?

• 10

• 20

• 30

• 40

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