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The image shows a physics worksheet in Russian for 9th grade about "Mechanical Waves. Sound." It includes task 4, asking to: 1. Determine the wavelength of a sound wave emitted by a speaker with a frequency of 2 Hz in water, where the speed of sound is considered 1450 m/s. 2. For a female singer, determine the maximum and minimum wavelength of the sound emitted in air with frequencies ranging from 262 Hz to 1046 Hz. The speed of sound in air is 340 m/s. These tasks involve calculating the wavelength using the formula: \[ \lambda = \frac{v}{f} \] where \( v \) is the speed of sound and \( f \) is the frequency.