Cathode ray tube experiment provided the first evidence of x-rays or subatomic particle magnetic field electric field?

The cathode ray tube experiment provided the first evidence of cathode rays, which were later identified as electrons. The experiment was conducted by the British physicist Sir William Crookes in 1875. He used a glass tube with a cathode (negative electrode) at one end and an anode (positive electrode) at the other end. When a high voltage was applied to the tube, a stream of electrons was emitted from the cathode and traveled to the anode. These electrons were called cathode rays.

Crookes' experiment showed that cathode rays could be deflected by a magnetic field. This suggested that cathode rays were charged particles, since charged particles are affected by magnetic fields. Further experiments showed that cathode rays could also be deflected by an electric field. This confirmed that cathode rays were indeed charged particles, and that they were negatively charged.

The discovery of cathode rays led to the development of the electron microscope, which is a powerful tool for imaging small objects. The electron microscope uses a beam of electrons instead of a beam of light to create images. This allows the electron microscope to achieve much higher resolution than a light microscope.