## Wavelength in Photoelectric Effect

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Joined: Wed Sep 30, 2020 10:03 pm

### Wavelength in Photoelectric Effect

Dr.Lavelle uses the analogy of runners to describe the fact that if the wavelength of light isn't high enough that no matter how high the frequency, electrons will not be emitted from a surface. Does anyone know what the range is that a wavelength has to be in order for electrons to be emitted from a surface?

Astha Patel 3D
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Joined: Wed Sep 30, 2020 10:03 pm
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### Re: Wavelength in Photoelectric Effect

It depends on the surface metal that has the electrons. Some metals require a greater frequency than others., so there's no exact range.

Christine Ma 3I
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Joined: Wed Sep 30, 2020 9:35 pm

### Re: Wavelength in Photoelectric Effect

The exact wavelength depends on the material of the surface the electrons are to be ejected from, since different elements hold onto their electrons with varying strengths. The energy of each photon has to be able to overcome the binding energy between the electron and its atom, and every atom is different. Usually though, the minimum wavelength of the light is somewhere in the UV region.

Evelyn Silva 3J
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Joined: Wed Sep 30, 2020 9:42 pm

### Re: Wavelength in Photoelectric Effect

The wavelength depends on the type of surface metal that is being used for the experiment. Some atoms have a greater binding energy, so they hold on to electrons more tightly than others and they require a higher frequency to be ejected. But UV light is usually the incoming light used for this experiment and that can give you an idea of the type of wavelength usually needed.

Renny_kim_2G
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Joined: Wed Sep 30, 2020 9:59 pm

### Re: Wavelength in Photoelectric Effect

The wavelength depends mainly on which metal surface you are talking about. This means that you cannot take the same approach for every problem. It varies each time.

505598869
Posts: 40
Joined: Wed Sep 30, 2020 9:43 pm

### Re: Wavelength in Photoelectric Effect

This is depends on the type of metal being used. Different metals will have a different threshold energy requirement for electrons to be removed.

Joanna Huang
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Joined: Wed Sep 30, 2020 9:40 pm

### Re: Wavelength in Photoelectric Effect

This differs depending on the metal. Each metal requires different work, or "threshold energy" levels in order for an electron to be ejected.

Muskaan Abdul-Sattar
Posts: 40
Joined: Wed Nov 13, 2019 12:19 am

### Re: Wavelength in Photoelectric Effect

I believe that the difference depends on the type of metal being used.