nothing

Basically we should also keep in mind knowledge about voltage and current.

If we keep voltage constant then by increase in temperature also increase the attenuation, if we keep current constant then attenuation drops by increasing temperature.

2x10^-3 Np/m

Drawback of the constant K type filter is that at the cut of frequency , its attenuation is a steady curve .. quick response is lacking in it

an ideal filter should have a sharp response curve.

There is no attenuation due to absorption, but attenuation will occur due to divergence (spreading out) of the wave.