Photoacoustic effect a rotating slotted wheel. He noticed that the resulting acoustic signal was dependent on the type of the material and correctly reasoned that the effect was caused by the absorbed light energy, which subsequently heats the sample. Later Bell showed that materials exposed to the non-visible (ultra-violet and infra-red) portions of the solar spectrum can also produce sounds and invented a device, which he called "spectrophone", to apply this effect for spectral identification of materials. Bell himself and later John Tyndall and Wilhelm Röntgen extended these experiments, demonstrating the same effect in liquids and gases. However, the results were too
Invisible Light Invisible Light "Invisible Light" is a song by American band Scissor Sisters, serving as the third and final single from their third studio album "Night Work". The track, which features guest vocals by actor Sir Ian McKellen, was what lead singer Jake Shears felt should have been the first single released for "Night Work", even after going with "Fire with Fire". The video for "Invisible Light" features a woman having a series of nightmares. She sees herself being dragged into the woods by a group of men, sleeping in a boat on a river, and attending her own funeral. The