Over at Physics Central, they’re talking about how LED hoopers and fire hoopers are showing physics in a whole new light. What does hoop dance have to do with physics? Photographer Jeremy Running explained, “I was a child with a fascination with the power to stop time, and an intense draw to technology. As an adult, my love for photography allows me to combine the two in a creative and artistic manner, pausing time and light forever.” His photos may have paused an instant in time, but they also show that even in that instant light is still traveling.
Physics Central explains, “When a photographer takes a picture his or her camera shutter opens and closes quickly, so quickly that most motion appears to stop when the picture is developed or, in the age of the digital camera, appears on the screen. Light travels much faster than the shutter can open and close, therefore allowing the camera to capture where the light has been in the time that the shutter was open. Light travels at 3×108 m/s, whereas a camera’s shutter speed can reach as fast as 1/8000 of a second, meaning that it stays open for one eight thousandth of a second, which is still really fast, but during that time light could travel 37,500 meters which is about 23 miles, 3.2 miles shy of a marathon.” Read more: Physics Central