Light

The absorption of light by blood experiment – an experiment with blood and colored lights.

The absorption of electromagnetic radiation happens all around us. In fact, this absorption process is the cornerstone for many modern-day technologies. Absorption of electromagnetic radiations allows the conversion of solar energy into electricity. The absorption of microwave electromagnetic radiation is what makes radars work. And our bodies absorb electromagnetic radiation too. Certain frequencies are absorbed easier by our bodies than others. In this experiment, we will demonstrate the body’s absorption of a common frequency range of electromagnetic radiation – visible light. In a darkened room, we will hold a red LED flashlight to our thumb. The thumb will glow bright red indicating much of the light passed right through our thumb. When we hold a green LED flashlight to our thumbs however, almost all of…
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Physics and math

Scientists capture first ever photo of light behaving as both a particle and a wave – and it’s a beauty

  Scientists have long believed that light can behave as both a particle and a wave but until today – it’s been a bit difficult to visualize and impossible to photograph. Now, researchers in Switzerland have taken the first ever picture of light as both a wave and a particle - and it's a beauty! To capture the historic photograph, researchers shot laser pulses at a tiny metallic nanowire and watched as the light moved in different directions along the metal wire (more accurately, they watched the emissions of electrons that occurs when light hits a metal surface). Then when the waves ran into each other, they snapped the historic photograph using a new ultrafast microscope. Quantum mechanics tells us that light can behave simultaneously…
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