Question

In a cathode ray tube, the thick glass screen is coated with barium platinocyanide because

• A. It produces fluorescence when electrons strikes the screen
• B. It generates more electrons when electrons strikes the screen
• C. It generates heat when electrons strikes the screen
• D. It absorbs light energy from the surroundings when electrons strikes the screen

Answer 1

The correct option is A

It produces fluorescence when electrons strikes the screen

Thick glass screen is coated with barium platinocyanide because electron beam on striking the screen gives a bright spot due to fluorescent property of barium platinocyanide.