Atoms that are cooled below a millikelvin can also be held in space with either static magnetic fields, laser fields, or a combination of a weak magnetic field and circularly polarized light. Atoms traps can be used to accumulate a … Read More
Month: October 2023
Lightning as an Electrical Phenomenon
Friction produces electric charges high in the atmosphere. This occurs when small particles such as water droplets and ice collide or rub against one another. Wind, among other factors, separates these charges and large electric forces develop between the ground … Read More
The Principle & Application of Nuclear Magnetic Resonance (NMR)
Nuclear magnetic moments (along with electronic magnetic moments) precess (spin) when placed in an external magnetic field, B. The frequency at which they precess, called the Lamor precessional frequency, wL, is directly proportional to the magnetic field.… Read More
The Physics Behind Magnetic Resonance Imaging (MRI)
MRI provides physicians with a tool to assess a patient’s health. To have an MRI exam, the patient lies in a very strong magnetic field that is generated by powerful magnets. The MRI machine then applies radio waves to the … Read More
The Bending of Starlight as Predicted by Einstein
Light falls in a gravitational field, for instance, a laser beam fired horizontally across a room will be closer to the ground on the side where it hits the far wall than it was when it left the laser. Likewise, … Read More