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- 1. Multiple Choice
Photoelectric effect provides the evidence for the ______ nature of radiation.
dual
wave
particle
electromagnetic
- 2. Multiple Choice
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
- 3. Multiple Choice
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
- 4. Multiple Choice
What is the energy, in eV, of a photon that has a wavelength of 620 nm?
1eV
2eV
3eV
4eV
- 5. Multiple Choice
The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.
intensity - speed
wavelength - frequency
frequency - wavelength
intensity - wavelength
- 6. Multiple Choice
Use the graph to find the threshold frequency.
−12×10-19 Hz
0 Hz
2×1015 Hz
4×1015 Hz
- 7. Multiple Choice
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
- 8. Multiple Choice
What does the slope of the graph represent?
Speed of light
Mass of a photon
Planck's constant
Stopping potential
- 9. Multiple Choice
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
- 10. Multiple Choice
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
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