Question 2

  When a dentist X-rays your teeth, a lead apron is placed over your chest and lower body. What is the purpose of this apron?

SOLUTION: You've probably heard this one before. The lead apron protects your delicate areas from exposure to x-rays. Why lead? Well, it's really dense, so an x-ray photon has a higher probability of being stopped by it. If you used another material, you'd need it to be thicker.