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EastWind [94]
3 years ago
8

What does the photoelectric effect prove?

Chemistry
1 answer:
Elza [17]3 years ago
6 0

Answer:

<em>By showing that changing the frequency of light causes the emission of faster electrons. </em>

Explanation:

<em>The photoelectric effect happens when light strikes a metal surface causing the emission of electrons from it (photoelectrons). </em>

<em>If you increase the intensity of the light you get, as acresult, more electrons emitted but their kinetic energy does not increase. </em>

<em>If you increase the frequency of the incident light the number of photoelectrons emitted does not increase while the velocity, and so their kinetic energy, increases...the emitted electrons are more...energetic! </em>

<em> </em>

<em>This can be explained considering the incident light as a shower of particle-like packets of energy (photons); if you increase the intensity you simply increase the number of packets (all with the same energy) hitting the metal; these can be used by a lot of electrons to escape. </em>

<em>On the other hand if you increase the frequency the number of packets remains the same (emitting fewer electrons perhaps) but the energy carried by each of them increases. </em>

<em>Each packet carries an energy directly proportional to the frequency.</em>

<em />

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The muscles on the run in transform chemical potential energy into_____
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Mechanical Energy

Mechanism energy is the energy associated with the position and motion of an object. Therefore it is also the summation of the kinetic and potential energies of the object.

Explanation:

Mechanism energy is the energy associated with the position and motion of an object. Therefore it is also the summation of the kinetic and potential energies of the object.

In the muscles, to have movement, the chemical bonds in ATP is broken to enable the sliding action of the myosin and actin fibres of a sarcomere (the basic unit of muscle). This sliding action is responsible for contraction of muscle.  The coordinated contractions and relaxations of sarcomeres on muscles result in movement which translates to mechanical energy.

This process is never 100% efficient with some energy lost as heat energy.

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Shkiper50 [21]

Answer:

exothermic

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This chemical reaction is an exothermic reaction because heat is liberated into the environment.

In organic chemistry, the reaction is termed a combustion reaction. In such a reaction, a fuel combines with oxygen to produce carbon dioxide and water.

It is an energy transformation from chemical energy to heat energy.

  • An exothermic reaction is one in which heat is liberated to the surrounding.
  • The surrounding becomes hotter at the end of the reaction.

In the reaction depicted, heat is liberated.

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