9th grade photoelectric effect

Photons of energy 2.1 eV cause a photoelectric currenton the surface of caesium, which has a workfunction of 1.9 eV. How many times should the energyof the photon be increased in order to double themaximum kinetic energy of the photoelectrons?

• 2.18
• 1.09
• 3.28
• 4.36

Tags

NGSS.HS-PS3-1

NGSS.HS-PS4-3

What must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)

• 2.35 eV
• 1.175 eV
• 4.7 eV
• 9.4 eV

Tags

NGSS.HS-PS4-3

What is the maximum kinetic energy of electrons emitted from cesium (Cs), when light of frequency10¹⁵ Hz falls upon the metal? (work function for Cs is 1.8 eV)

• 7.728x10^-19 J
• 4.83 eV
• 1.864x10^-19 J
• 2.34 eV

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

• only high frequency
• only low frequency
• both of them
• doesn't depend to frequency

Tags

NGSS.HS-PS4-4

Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

• only high frequency
• only low frequency
• both of them
• doesn't depend to frequency

Tags

NGSS.HS-PS4-4

Do the photons of violet light or the photons of red light, falling on a metal surface with the same intensity,cause emission of more electrons?

•  red light
• violet light
• same 

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

The photoelectric effect is observed on barium oxide(BaO) at a minimum frequency of 0.24x10¹⁵ Hz . Find the work function of bariumoxide in eV.

• 1 eV
• 2 eV
• 1.6 eV
• 2.7 eV

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

The cut-off wavelength for the photoelectric effect of platinum is 220 nm. Find the work function of platinum in eV

• 11.25 eV
• 9 eV
• 4.5 eV
• 5.65 eV

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Find the cut-off wavelength for the photoelectriceffect in tungsten (work function for tungsten is 4.5 eV)

• 138 nm
• 414 nm
• 552 nm
• 276 nm

Tags

NGSS.HS-PS4-1

Green light with a wavelength of 5461 Å, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface. Calculate the work function of the metal.

• 2.14 eV
• 1.07 eV
• 3.21 eV
• 0.535 eV

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3