A TIG welding arc emits intense ultraviolet (UV-C) radiation with a wavelength ($\lambda$) of 254 nanometers (nm). Using Planck's equation, calculate the energy ($E$) of a single photon emitted by the arc.

A welder strikes an arc generating a UV intensity of $50 \text{ W/m}^2$ at a distance of 1 meter. A helper is holding a piece of steel exactly 2 meters away and is not wearing a welding hood. Using the inverse square law, calculate the UV intensity hitting the helper's eyes.

An oxy-acetylene rig is being set up. The worker sets the acetylene regulator output to 25 PSI to get a larger flame for cutting a thick steel plate. Why is this mathematically and chemically lethal?

A worker spends a 10-hour shift arc welding galvanized steel ductwork in a poorly ventilated basement. They go home feeling fine, but wake up at 2:00 AM violently shivering, sweating, and experiencing severe muscle aches, believing they have caught the flu.

A fabricator is Tig welding stainless steel tanks. They wear a standard N95 paper dust mask and use a floor fan blowing across the room to clear the smoke.