Intensity of Light

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Sophia Dinh 1D
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Intensity of Light

Postby Sophia Dinh 1D » Mon Oct 21, 2019 5:33 pm

Why does increasing intensity not eject an electron?

Posts: 103
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Re: Intensity of Light

Postby 005391550 » Mon Oct 21, 2019 5:47 pm

because increasing the intensity is equivalent to increasing the number of photons but it doesn't change the energy each photon has. the energy each photon contains is what ejects the electron

kim 2I
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Re: Intensity of Light

Postby kim 2I » Mon Oct 21, 2019 8:14 pm

It is important to consider light as photon packets of energy where a single photon interacts with a single electron. Therefore, each individual photon must have enough energy to remove each electron. Increasing the intensity only increased the number of photons that are hitting the surface of the metal, not the energy of each photon. However, it is true that if the energy per photon is greater or equal to the energy needed to remove an electron, then increasing the light's intensity would eject more electrons (since there are more photon-to-electron interactions).

Alexa Hernandez 3k
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Re: Intensity of Light

Postby Alexa Hernandez 3k » Mon Oct 21, 2019 8:17 pm

Increasing the intensity increases the overall number of photons. In order to eject a single electron you need enough energy within a single photon.

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Re: Intensity of Light

Postby Diana_Diep2I » Tue Oct 22, 2019 2:20 pm

This is shown in the equation, E=hv. Energy of the photon is affected by the frequency and not the intensity. If there is not enough energy (frequency is not high enough) then e- wouldn't be emitted.

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