Quantum physics (ch 24)

The photoelectric effect helps us to understand

• the particle nature of light.
• diffraction pattern produced as light passes through a single slit.
• the wave behavior of light.
• spectroscopes.

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The photoelectric experiment is where

• two atoms are forced to collide.
• you look through diffraction glasses to see the emission spectrum of light.
• light is shined on a piece of metal and electrons are ejected.
• two atoms are split.

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The emission of electrons produced when radiation strikes a metal.

• photoelectric effect
• stimulated emission
• polarization
• galvanation

Which two correctly describe blackbodies. (mark 3 correct answers)

• Perfect absorbers and emitters of radiation.

• Thermal insulators located in space.

• The emitted radiation is dependent on the temperature.

• They emit different wavelengths of light depending on their absorption spectrum.

• They are theoretical objects, true blackbodies do not exist.

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Units of light emitted by a blackbody were originally called _____.

• resonators

• amperes

• bolts

• quanta

This spectrum shows the light absorbed by atoms is travels through? It appears as dark lines on a rainbow.

• emission spectrum

• absorption spectrum

• dispersion spectrum

• Helium spectrum

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Which is the true statements regarding absorption spectra?

• The wavelengths (and also the frequencies) of the spectrum are characteristic of the element emitting the light.

• The wavelength of the spectrum are the same for all elements.

• Absorption spectra form bright lines, representing small segments of the spectrum.

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Due to specific frequencies of light being absorbed, the absorption spectrum looks like which of the following.

• Bright lines on a dark background

• Dark lines on a full spectrum

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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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This image is an illustration of

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

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