Ultrasonic Velocity and Absorption in Aqueous Lactose Solution

The ultrasonic velocity and absorption measurements were carried out in aqueous solution oflactose over the entire range of concentration from 0.00 M to 0.1M and temperature range between 293 K to 313 K at frequenicy1MHz,4MHz,5MHz and10 MHz. The Pulse echo overlap technique has been used for the measurement of velocity and echo-amplitudes. These values are utilised to evaluate the non-linear properties such as adiabatic compressibility((βa),relaxation time(τ), classical and observed absorption(α/f 2 ), etc .These parameters show nonlinear increase or decrease with various concentration and temperatures. These parameters are interpreted as due to the formation of intermolecular hydrogen bonding between the hydroxyl groups of lactose and water molecules.