The disbalance of the theory and experimentally established properties of the silver halide photographic materials was considered and a conclusion on the existence at least three mechanisms of the latent image speck formation was drown: conventional Gerny-Mott mechanism and two another ones-vibrational and dislocational. The experimental verification of the vibrational mechanism was fulfilled with the impulse laser optoacoustic method on the pholographic materials under careful control. The period of the latent image speck formation found to be as short as 2.10~8 sec~(-1). No evidence of the electron-hole pairs generation was established under experimental conditions. The mechanism of the optoacoustic effect was purely thermal.
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