Applications Of Modern Physics -

The laser is the quintessential quantum device. Einstein predicted stimulated emission in 1917, but it took 40 years to build the first working laser. Today, lasers perform delicate surgeries (LASIK eye correction), destroy kidney stones, remove tumors with precision, and enable photodynamic therapy for cancer.

Radio waves at the Larmor frequency (predicted by quantum mechanics) flip these spins. When they relax back, they emit signals that a computer reconstructs into 3D images of soft tissue. Unlike X-rays, MRI uses no ionizing radiation, making it safe for repeated use. Applications Of Modern Physics