Photoacoustic spectroscopy Photoacoustic spectroscopy Photoacoustic spectroscopy is the measurement of the effect of absorbed electromagnetic energy (particularly of light) on matter by means of acoustic detection. The discovery of the photoacoustic effect dates to 1880 when Alexander Graham Bell showed that thin discs emitted sound when exposed to a beam of sunlight that was rapidly interrupted with a rotating slotted disk. The absorbed energy from the light causes local heating, generating a thermal expansion which creates a pressure wave or sound. Later Bell showed that materials exposed to the non-visible portions of the solar spectrum (i.e., the infrared and the ultraviolet) can
Invisible Light song itself was cut down from its 6-minute album length into a radio edit of 4 minutes in length, and features the vocals of Sir McKellen spoken through an actor portraying a hypnotist. The bands' members describe the video as "a magical trip down the rabbit hole". The video is inspired by the nightmares of Mia Farrow in "Rosemary's Baby" and Catherine Deneuve in "Belle de jour". Liz Taylor's version of Cleopatra also appears as a character of the video. Invisible Light "Invisible Light" is a song by American band Scissor Sisters, serving as the third and final single from