## Intensity v Frequency

TanveerDhaliwal3G
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

### Intensity v Frequency

Can someone explain the difference between intensity and frequency?

Posts: 87
Joined: Sat Aug 24, 2019 12:15 am

### Re: Intensity v Frequency

Frequency is the speed at which light travels, while intensity is the amount of light or photons present. bFor example, when we change the wavelength then we change the frequency in aspects such as different colors. In contrast, the intensity would be compared to having one light source shining light and then having three, the intensity would increase by three. Imagine intensity as shining more or a stronger light on the same object while frequency is changing the actual characteristic of light that is shining.

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

### Re: Intensity v Frequency

With regards to the photoelectric effect and wave model of light, doubling the intensity (greater amplitude for wave) of the light source should have emitted electrons. Energy was correlated to intensity. However, this result did not occur. For the photon model, intensity correlates to increasing the number of photons emitted from the light source and electrons were ejected when a high enough frequency occurred. Energy is proportional to frequency here. This experiment demonstrates the wave-particle duality of electromagnetic radiation.

Matthew Tsai 2H
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

### Re: Intensity v Frequency

Intensity is determined by amplitude of a wave while frequency is determined by the length (specifically how short) a wave is. In the famous photoelectric effect experiment, it was determined that the energy of light is proportional to frequency, rather than the expected which was amplitude/intensity, thus demonstrating the wave-particle duality.

Kimme Chun 1I
Posts: 22
Joined: Sat Sep 07, 2019 12:17 am
Been upvoted: 1 time

### Re: Intensity v Frequency

The frequency is referring to how much energy a photon has and the intensity is referring to how many photons are present.

Sean1F
Posts: 19
Joined: Sat Sep 07, 2019 12:16 am

### Re: Intensity v Frequency

Kimme Chun 1I wrote:The frequency is referring to how much energy a photon has and the intensity is referring to how many photons are present.

I don't think they have a direct relationship since both can vary.