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4 years ago

7

Which of the following experiments or phenomena provided evidence for the particle nature of light?

2 answers:

Marysya12 [62]4 years ago

8 0

<h3><u>Answer;</u></h3>

Expulsion of electrons with varying frequencies of light observed in the photoelectron effect.

<h3><u>Explanation</u>;</h3>

<em><u>The photoelectric effect supports a particle theory of light in that it behaves like an elastic collision between two particles, the photon of light and the electron of the metal.</u></em>
Albert Einstein observed the photoelectric effect in which ultraviolet light forces a surface to release electrons when the light hits. He explained the reaction by defining light as a stream of photons, or energy packets.

Dima020 [189]4 years ago

6 0

Answer:

Expulsion of electrons with varying frequencies of light observed in the photoelectron effect.

Explanation:

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Calculate the heat energy released when 13.3 g of liquid mercury at 25.00 C is converted to solid mercury at its melting point.C

dmitriy555 [2]

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$-270.321012\ J$

Explanation:

$C_v$ = Heat capacity of Hg = 28 J/mol

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The number of moles is given by

$n=13.3\times \dfrac{1}{200.59}\\\Rightarrow n=0.0663\ molHg$

Heat is given by

$Q_1=nC_v\Delta T\\\Rightarrow Q_1=0.0663\times 28\times (234.32-(273.15+25))\\\Rightarrow Q_1=-118.494012\ J$

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$Q_2=-n\Delta H_{f}\\\Rightarrow Q_2=-0.0663\times 2.29\times 10^3\\\Rightarrow Q_2=-151.827\ J$

Total heat is given by

$Q=Q_1+Q_2\\\Rightarrow Q=-118.494012+(-151.827)\\\Rightarrow Q=-270.321012\ J$

The total heat released is $-270.321012\ J$

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