0.7 Hz. According to relevant data, the vibration frequency of aluminum plate and steel plate is 0.7 Hz, and the vibration frequency of metal is related to the structure and material of metal. * * * Vibration frequency refers to the situation that the vibration amplitude of a physical system at a specific frequency and wavelength is greater than other frequencies and wavelengths; These specific frequencies and wavelengths are called * * * vibration frequency and * * * vibration wavelength. At * * * vibration frequency and * * vibration wavelength, a small periodic vibration can produce great vibration because the system stores kinetic energy.