Final answer:
To prevent flickering on a CRT TV, a technique called interlaced scanning is used. This method refreshes odd and even lines of the display in alternation. CRTs use high-energy electrons that could generate X-rays, but TVs are shielded to prevent exposure.
Step-by-step explanation:
To prevent an unnecessary flicker effect when viewing a CRT television image, a technique called interlaced scanning is used. This technique involves splitting the screen display into odd and even lines and then refreshing them in alternating fashion. First, the odd lines are drawn on the screen, and then the even lines are drawn during the next refresh cycle. This approach essentially doubles the perceived frame rate and minimizes flickering without needing to increase the actual refresh rate of the screen.
Cathode Ray Tubes (CRTs) utilize an accelerating potential to send electrons to the screen. When these electrons strike the phosphors on the screen, they emit light, forming the image we see. These high-energy electrons can also potentially generate X-rays, but CRT televisions are designed with shielding to block any harmful X-ray emissions.