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1B #3

Posted: Wed Oct 16, 2019 11:28 am
by Kelly Cai 4D
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

Re: 1B #3

Posted: Wed Oct 16, 2019 11:37 am
by Chem_Mod
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.

Re: 1B #3

Posted: Wed Oct 16, 2019 12:04 pm
by Ariel Davydov 1C
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.