To experimentally show the transfer of energy by radiation, you need to use a thermoscope, to the dark surface of which a heated piece of metal is vertically brought up. The lowering of the liquid in the elbow of the manometer connected to the heat sink is explained by the fact that the air in the heat sink is heated and expanded due to the transfer of energy from the heated piece to it by radiation.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.