Dual nature of matter

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

• Intensity

• Wavelength

• Frequency

• Energy

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A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

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What color of light has the greatest energy per photon?

• Red

• Green

• Blue

• Violet

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This image is an illustration of

• photoelectric effect
• Dalton's atomic theory
• Bohr model
• Quantum mechanical model

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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.

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Which statement about the photoelectric effect is correct?

• Electrons are emitted instantaneously.
• Electrons are not emitted below a certain wavelength.
• You can change the energy of the electrons by changing the intensity.
• Electron energy is independent of frequency.

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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

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In photoelectric effect, electrons should be removed from the

• inner shells

• surface

• from core

• nucleus

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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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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.

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