Photoelectric effect

Photoelectric effect provides the evidence for the ______ nature of radiation.

• dual

• wave

• particle

• electromagnetic

Tags

NGSS.HS-PS4-3

If the brightness of a beam of light increases without changing its color, the ______ will increase.

• number of photons

• frequency of the light

• energy of the photons

• wavelength of the photons

Tags

NGSS.HS-PS4-4

Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

• lower energy

• higher intensity

• shorter frequency

• higher frequency

Tags

NGSS.HS-PS4-4

What is the energy, in eV, of a photon that has a wavelength of 620 nm?

• 1eV

• 2eV

• 3eV

• 4eV

Tags

NGSS.HS-PS4-1

The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.

• intensity - speed

• wavelength - frequency

• frequency - wavelength

• intensity - wavelength

Tags

NGSS.HS-PS4-1

Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-4

In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, _______.

• electrons will be ejected from the metal surface

• there will be photoelectric current

• no electrons will be emitted from the metal surface

• the kinetic energy of the ejected electrons increases

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

What does the slope of the graph represent?

• Speed of light

• Mass of a photon

• Planck's constant

• Stopping potential

A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?

• 0.2 eV

• 0.9 eV

• 1.1 eV

• 7.7 eV

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

What is the energy of a photon with a frequency of 5x10¹⁴ Hz? (you need to do calculation. You have enough time)

• 2.5x10^-19 J

• 3.0x10^-19 J

• 3.3x10^-19 J

• 4.5x10^-19 J

Tags

NGSS.HS-PS4-1