The image is a photograph of a blackboard with Chinese text written on it. The text is written in both English and Chinese characters. Below the text, there is an illustration of an electromagnetic spectrum, which is a type of waveform that is used to measure the frequency of electromagnetic waves. The illustration shows a waveform with a blue light emanating from it, representing the waveform. The waveform is surrounded by a white background. The image appears to be taken in a museum or exhibition space, as there is a sign on the left side of the board that reads "Electromagnetic Spectrum".