@article {Krupska:2001:0143-0807:133,
	author = "Krupska A.",
	author = "Krupski M.",
	author = "Konarski J.",
	title = "Phase delay effect in a thermally homogeneous system heated periodically",
	journal = "European Journal of Physics",
	volume = "22",
	year = "2001",
	abstract = "<P>The response of a thermally homogeneous system to a periodical heat inflow was studied. The results of the calculations and the experiment proved that the system's temperature changed periodically with a certain phase delay [iopmath latex="$\phi$"] [/iopmath] relative to the stimulus (heat influx) and dependent on the period [iopmath latex="$T_{\rm h}$"] <I>T</I><SUB>h</SUB> [/iopmath] and the system's relaxation time [iopmath latex="$\tau$"] [/iopmath] , according to the equation [iopmath latex="$\tan\phi = 2 \omega \tau$"] tan = 2 [/iopmath] , where [iopmath latex="$\omega = 2 \pi/T_{\rm h}$"] = 2/<I>T</I><SUB>h</SUB> [/iopmath] . This relationship can be used for determination of [iopmath latex="$\tau$"] [/iopmath] and the heat capacity of the system. The simple theory and experiment is a good example for understanding other relaxing processes of the exponential form and may be helpful to physics teachers at university level.</P>",
	pages = "133-138(6)",
	url = "http://www.ingentaconnect.com/content/iop/ejp/2001/00000022/00000002/art00305"
}