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- Multiple ChoicePlease save your changes before editing any questions.
A particle of light is called a...
Photoelectron
Photon
Proton
Electron
- Multiple ChoicePlease save your changes before editing any questions.
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
- Multiple ChoicePlease save your changes before editing any questions.
What color of light has the greatest energy per photon?
Red
Green
Blue
Violet
- Multiple ChoicePlease save your changes before editing any questions.
The energy of photoelectrons emitted from a metal surface can be increased by
using light of higher frequency.
using light of longer wavelength.
using light of higher intensity.
using monochromatic, polarized light.
- Multiple ChoicePlease save your changes before editing any questions.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.
- Multiple ChoicePlease save your changes before editing any questions.Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?only high frequencyonly low frequencyboth of themdoesn't depend to frequency
- Multiple ChoicePlease save your changes before editing any questions.
What is the best description of 'threshold frequency'?
The minimum energy needed for electrons to escape a surface.
The maximum kinetic energy that an emitted electron has.
The minimum frequency of a photon that will cause an electron to be emitted.
The frequency that an emitted electron will have.
- Multiple ChoicePlease save your changes before editing any questions.
Photoelectric effect provides the evidence for the ______ nature of radiation.
dual
wave
particle
electromagnetic
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
What is the energy, in eV, of a photon that has a wavelength of 620 nm?
1eV
2eV
3eV
4eV
- Multiple ChoicePlease save your changes before editing any questions.
The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.
intensity - speed
wavelength - frequency
frequency - wavelength
intensity - wavelength
- Multiple ChoicePlease save your changes before editing any questions.
Use the graph to find the threshold frequency.
−12×10-19 Hz
0 Hz
2×1015 Hz
4×1015 Hz
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
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
- Multiple ChoicePlease save your changes before editing any questions.
What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation. You have enough time) h=6.6x10-34 J/Hz
2.5x10-19 J
3.0x10-19 J
3.3x10-19 J
4.5x10-19 J