PRIBADI DEPOK 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-PS4-1

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-PS4-1

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 with a work function of W₀ = hc/550 nm is struck with blue light and electrons are released. If the blue light is replaced by red light of the same intensity, what is the result?

• No electrons are emitted

• Fewer electrons are emitted in a given time interval

• Emitted electrons are less energetic

• Emitted electrons are more energetic

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NGSS.HS-PS4-1

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-PS4-3

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

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NGSS.HS-PS4-3

A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?

• The red beam

• The violet beam

• The number of photons per second is the same for both beams

• This cannot be answered without knowing just what the light intensity

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle

• Increases.

• Decreases

• Does not change

• Varies randomly

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

Determine the ratio of photon’s energy of a monochromatic ray with 6000 Å Wavelength and 4000 Å wavelength!

• 1:2

• 2:3

• 1:3

• 2:4

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

An object that is vibrating by frequency 4 x10¹⁵ Hz. What is the vibrating energy of that object according to Planck’s quantum theory?

• 26.5 x 10^-19 J

• 28.7 x 10^-19J

• 29.7 x 10^-19 J

• 32.6 x 10^-19 J

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NGSS.HS-PS4-1