1B #3

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Kelly Cai 4D
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1B #3

Postby Kelly Cai 4D » Wed Oct 16, 2019 11:28 am

From the following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles. Explain your reasoning.

(a). black-body radiation
(b). electron diffraction
(c). atomic spectra
(d). the photoelectric effect

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Re: 1B #3

Postby Chem_Mod » Wed Oct 16, 2019 11:37 am

Black body radiation is a tough, abstract concept that particles within a substance emit light when heated (deals with frequency and wavelength of light emitted), diffraction describes how the wave nature of electrons can interact with each other constructively and destructively to create a diffraction pattern, and atomic spectra also has to do with light emitted or absorbed, and is frequency/wavelength dependent thus a - c pertain to the wave properties of light. The photoelectric effect describes how light can eject electrons from a metal. This observation is best explained through adapting a particle nature of light where the particle is of sufficient energy to dislodge an electron, therefore the answer is d.

Ariel Davydov 1C
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Re: 1B #3

Postby Ariel Davydov 1C » Wed Oct 16, 2019 12:04 pm

D, the photoelectric effect, best explains that electrons have particle-like properties. This experiment shows that, when light is shone onto a metal sample, electrons are emitted at a one-to-one ratio to the photons that are absorbed by the sample. This is also supported by the equation E=hv, which provides us with the energy per photon, thus per particle.

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