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

Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

Tags

NGSS.HS-PS4-4

NGSS.HS-PS4-1

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

• 0.6x10^-19 J

• 3.5x10^-19 J

• 4.5x10^-19 J

The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?

• Increasing the potential difference of the power supply.
• Increasing the frequency of the UV light.
• Increasing the intensity of the UV light.
• Changing the metal surface to one with a smaller work function.

Tags

NGSS.HS-PS4-3

What is the maximum kinetic energy of electrons emitted from caesium (Cs), when light of frequency 1x 10¹⁵ Hz falls upon the metal? (work function for Cs is 2.0eV)

• 8.0x10^-19 J

• 4.0 eV

• 2.0 x10^-19 J

• 2.0 eV