Photoelectric Effect

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

Tags

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

Tags

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

Tags

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

Tags

NGSS.HS-PS4-3

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-PS4-1

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

Planck's constant can be found ...

• energy of a particle x speed of light / wavelength

• energy of a particle x speed of light / frequency of light

• energy of a particle x wavelength / speed of light

• slope of the cut-off voltage vs frequency graph

Tags

NGSS.HS-PS4-1

What is the photoelectric effect?

• Emission of electrons from a metal surface when light shines on it

• Absorption of light by a metal surface

• Reflection of light from a metal surface

• Transmission of light through a metal surface

Tags

NGSS.HS-PS4-3

Which of the following factors does NOT affect the photoelectric effect?

• Frequency of the incident light

• Intensity of the incident light

• Work function of the metal

• Temperature of the metal

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

If the frequency of incident light is below the threshold frequency, what happens in the photoelectric effect?

• Electrons are emitted with reduced energy

• No electrons are emitted

• Electrons are emitted with increased energy

• Electrons are emitted at a constant rate

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4