Related: How does astronomy use the electromagnetic spectrum? How do scientists know dark matter is there? A halo of dark matter, represented in purple, surrounds the inner region of a galaxy cluster called Abell 1689. (Image credit: NASA/ESA/JPL-Caltech/Yale/CNRS) Although dark matter does...
In the physics classroom, content based on superheroes can be used in support of learning materials on topics such as optics, advanced materials, kinematics, and the electromagnetic (EM) spectrum. Studies have highlighted several student preconceptions with regards to different radiation types. For ...
TEMs are the most powerful electron microscopes: we can use them to see things just 1 nanometer in size, so they effectively magnify by a million times or more.How a transmission electron microscope (TEM) works A transmission electron microscope fires a beam of electrons through a specimen to...
Electromagnetic (EM) radiation, on the other hand, has no mass and travels in waves. EM radiation can range from very low energy to very high energy, and we call this span the electromagnetic spectrum. Within the EM spectrum, there are two types of radiation -- ionizing and non-ionizing....
The X-ray spectrum is not to be mistaken for the X band, which is a low-energy part that is part of the electromagnetic spectrum. While both bands are separated by only a couple of hundreds of nanometers each, they do not have the same characteristics.Because X-rays are ...
Here, an electromagnet is used to pick up some of the approximately 3,500 confiscated guns to be melted down. David McNew/Getty Images What do a wrecking yard, a rock concert and your front door have in common? They each use electromagnets, devices that create a magnetic field through ...
This energy is part of the radio spectrum, but scientists haven't figured out how to detect it. Pet psychics can use energy to contact animals, no matter how far away the animals are or whether they are still living. In the next section we'll look at the different methods pet psychics...
Here, an electromagnet is used to pick up some of the approximately 3,500 confiscated guns to be melted down. David McNew/Getty Images What do a wrecking yard, a rock concert and your front door have in common? They each use electromagnets, devices that create a magnetic field through ...
A radio wave is an electromagnetic wave propagated by an antenna. Radio waves have different frequencies, and by tuning a radio receiver to a specific frequency you can pick up a specific signal. In the United States, the FCC (Federal Communications Commission) decides who is able to use whic...
Nor do we understand the limits of tolerance any given species has for environmental disturbance — some show high flexibility while others thrive only within the narrowest ranges. One estimate of Earth’s species finds that since 1970, wild animal populations have been reduced on average by 60%...