Is intensity is directly proportional to intensity

[Aafia]

Or intensity and frequency are same things ..

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[amy_k]

Definitely not the same things. Intensity = power / area, in other words the concentration of energy in a wave over time and area determines its intensity. We must therefore take into account both frequency and amplitude.

 

[Aafia]

Sorry there is some mistake in writing question . I want to know that how intensity is related with frequency

 

[amy_k]

Yes i read it that way and responded accordingly

 

[m25]

Definitely not the same things. Intensity = power / area, in other words the concentration of energy in a wave over time and area determines its intensity. We must therefore take into account both frequency and amplitude.

So higher the frequency, higher the intensity, given that amplitude stays the same? Will they show a linear relationship in this case?

 

[krukshanks]

So higher the frequency, higher the intensity, given that amplitude stays the same? Will they show a linear relationship in this case?

It is not linear.

Intensity is proportional to the square of amplitude and the square of frequency.

http://www.insula.com.au/physics/1279/L14.html

Scroll the page above to middle-ish and there is a formula (they used omega rather than f, and omega stands for the angular frequency, which is omega = 2pi * f).

This formula is also found in the old version of EK physics, on the chapter of waves.

 

[amy_k]

m25 said: ↑
So higher the frequency, higher the intensity, given that amplitude stays the same? Will they show a linear relationship in this case?

As krukshanks said, it won't be linear but the higher the frequency or the higher the amplitude, the higher the intensity of the wave.