30.3 MB (1.7 MB compressed)
2987 x 3541 pixels
25.4 x 30.0 cm ⏐ 10.0 x 11.8 in (300dpi)
DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY
Mobile telephone use. Thermogram of a woman using a mobile or cellular telephone showing the variation in temperature. The temperature scale runs from red (warmest), through yellow, green and cyan, to blue (coldest). Thermography is a technique for visualising the temperature of surfaces by recording their emission of long- wavelength infrared radiation. This heat radiation is detected electronically. Mobile telephones use low-power radio signals to transmit a signal calls to an antenna in the user's local area or cell. The call will then be connected to another mobile telephone, or, if necessary, a conventional telephone exchange.
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