Coolis tube is used to produce A. Radio waves B. Micro waves C. X-rays D. Gama rays

The correct answer is C. X-rays.

A Coolidge tube is a type of vacuum tube that is used to produce X-rays. It was invented by William D. Coolidge in 1913. The tube consists of a cathode, an anode, and a filament. The cathode is heated, which causes electrons to be emitted. The electrons are then accelerated towards the anode by a high voltage. When the electrons hit the anode, they produce X-rays.

Radio waves are a type of electromagnetic radiation with wavelengths longer than those of visible light.

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