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Postby NicoJones_1B » Fri Oct 11, 2019 9:41 pm

I am reviewing my notes in the photoelectric effect section and I wrote down that,"Quantum Mechanic's description of light is why short wavelengths of light can eject electrons from metal surfaces, while longer wavelengths don't". Can anyone explain why this property occurs to me?

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Re: Wavelengths

Postby McKenna_4A » Fri Oct 11, 2019 10:39 pm

Longer wavelengths means they have a higher frequency, or velocity. The equation Velocity=(freq)(wavelength) explains this

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Re: Wavelengths

Postby Maia_Jackson_2C » Fri Oct 11, 2019 10:46 pm

Also wavelength is inversely proportional to frequency, increasing one decreases the other, so with a short wavelength of light, there would be a higher frequency and the electron would eject.

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Re: Wavelengths

Postby DLee_1L » Fri Oct 11, 2019 11:40 pm

The quantum mechanic description of light is that an object usually displays particle-like behavior, but wave-like behavior occurs when an object is small (>10^-15 m small). Through the photoelectric experiment, it was seen that light acted as more of a particle since increasing the amplitude/intensity of the wave did not result in a change in the KE of the light, but an increase in frequency increased the KE.

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Re: Wavelengths

Postby TYun_1C » Fri Oct 11, 2019 11:45 pm

Looking at the speed of light equation, as the wavelength increases, the frequency increases. Seeing that higher frequency light can eject electrons while higher intensity light cannot, this proves the photon properties of light.

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