## Wavelengths

NicoJones_1B
Posts: 49
Joined: Fri Aug 09, 2019 12:16 am

### Wavelengths

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?

McKenna_4A
Posts: 115
Joined: Sat Aug 24, 2019 12:18 am

### Re: Wavelengths

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

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

### Re: Wavelengths

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.

DLee_1L
Posts: 103
Joined: Sat Aug 17, 2019 12:17 am

### Re: Wavelengths

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.

TYun_1C
Posts: 52
Joined: Wed Sep 11, 2019 12:16 am

### Re: Wavelengths

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.