[LINK] Our wireless world...

[Gordon Keith]

On Wed, 29 Nov 2006 12:54, Richard Chirgwin wrote:
> "Wavelength in body tissue is not the same as in air"? - I am not quite
> sure what you mean - that the wavelength of the cellphone signal changes
> as the signal passes into the body? Yes, the body interacts differently
> with different frequencies, but a 1.8GHz passing through something is
> surely 1.8GHz on the other side...

1.GHz is the frequency, not the wavelength. 

The frequency doesn't change.

Wavelength = velocity / frequency.

The velocity of radio signals through the air is different to the velocity of 
radio signals through the body, hence for the same frequency the wavelength 
is different.

Regards
Gordon