TOPIC: BASICS OF X-RAY🌟 IMPORTANT POINTS TO REMEMBER🔹Hard rays: X-rays having shorter wavelengths have great penetrating power and are called hard rays.🔹Soft rays: X-rays having longer wavelengths possess less energy and less penetrating power. These are called Grenz rays.🔹Thermionic emission: It can be defined as the phenomenon of emission of electrons by metal when it is heated. The electron stays in an electron cloud until a high-voltage circuit is activated. The electron emitted under this action is called thermion.
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