Frequency, wavelength, and Energy of light


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Banik_Housepian_2K
Posts: 39
Joined: Wed Sep 21, 2016 2:59 pm

Frequency, wavelength, and Energy of light

Postby Banik_Housepian_2K » Mon Sep 26, 2016 7:05 pm

Is the energy what determines whether or not a wave is harmful to humans? or does it have to do with the frequency or wavelength?

Chem_Mod
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Re: Frequency, wavelength, and Energy of light

Postby Chem_Mod » Mon Sep 26, 2016 8:49 pm

Since those quantities are actually related to each other, you could say that any of those qualities are the defining characteristics of what effects radiation has on the human body. I think I understand your question though. The reason that long term exposure to UV rays or blue light is potentially harmful to the human body is because their shorter wavelengths correspond to higher energy. This increased energy gives these photons the ability to ionize atoms and thus affect the base chemical structure of a molecule. This causes the increased likelihood of mutations to form since the energy from these UV photons can unintentionally break or reform chemical bonds.

Edgar Khachatryan 3G
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Joined: Fri Jul 15, 2016 3:00 am

Re: Frequency, wavelength, and Energy of light

Postby Edgar Khachatryan 3G » Thu Sep 29, 2016 11:49 pm

What is the difference between the "energy" and "intensity" of a wave? Or are they referring to the same point in mind?

Sedra_Tibi_1L
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

Re: Frequency, wavelength, and Energy of light

Postby Sedra_Tibi_1L » Fri Sep 30, 2016 9:56 am

Energy of a wave, measured in just Joules, is the energy of the whole wave, while intensity of a wave is measured in Joules per second per meter, so intensity measures the number of photons going through a single particle of the wave. Energy measures all the energy transmitted by the wave. Overall, energy is the power of the entire wave and intensity measures the power passing through a single particle of the wave. Hope this helps :)

Eli Pazol 2F
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Joined: Wed Sep 21, 2016 2:58 pm

Re: Frequency, wavelength, and Energy of light

Postby Eli Pazol 2F » Fri Sep 30, 2016 12:58 pm

if you think of light as a particle(photon), then think of intensity as the number of photons, and frequency the determinant of the energy of each individual photon. So increasing the intensity means increasing the number of photons per second or however you want to define it. increasing the frequency means increasing the energy per photon

michaeljwilson3
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

Re: Frequency, wavelength, and Energy of light

Postby michaeljwilson3 » Fri Sep 30, 2016 3:23 pm

In what situations does light act as a wave, and when does it act like a particle?


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