Quantum Physics

Photoelectrons will be ejected from a material surface if?

• The threshold frequency is greater than the photon frequency

• The work function is less than the photon energy

• The intensity of light is high enough

• The wavelength of photon is maximum

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NGSS.HS-PS4-3

A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

• 4.2 eV

• 4.4 eV

• 4.7 eV

• 4.9 eV

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NGSS.HS-PS4-3

In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

• Will not be ejected

• Will be ejected as observed in the previous

• Will be ejected with greater number of photoelectrons

• Will be ejected with greater kinetic energy

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NGSS.HS-PS4-3

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

• More electrons are emitted in a given time interval

• Fewer electrons are emitted in a given time interval

• Emitted electrons are more energetic

• Emitted electrons are less energetic

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the light intensity is increased (without changing λ ), what is the result?

• More electrons are emitted in a given time interval

• Fewer electrons are emitted in a given time interval

• Emitted electrons are more energetic

• Emitted electrons are less energetic

Tags

NGSS.HS-PS4-3

The photoelectric effect only occurs if the light shining on the metal is:

• coherent.

• above a minimum intensity.

• above a minimum frequency.

• above a minimum wavelength.

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Wave -particle duality is supported by...

• electrons behaving as particles with ordinary matter

• electrons behaving as waves when travelling through space

• the photo electric effect

• all of the above

Tags

NGSS.HS-PS4-3

the minimum frequency for which the photoelectric effect can occur is called the

• absolute frequency

• cut off frequency

• Lyman frequency

• threshold frequency

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NGSS.HS-PS4-4

De Broglie equation

• relates the momentum of a mass to its wavelength

• relates the energy of a mass to its wavelength

• relates the frequency of a mass to its wavelength

• relates the work function of a mass to its wavelength

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NGSS.HS-PS2-2

NGSS.HS-PS4-1

The energy of an emitted photon can be calculated from ...

• Plancks constant x frequency of the photon

• h x c / wavelength of the light emitted

• the difference in the energy levels

• all of the above

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3