What are the four initial resonant frequencies of a closed tube 50 cm long?

A periodic wave of wavelength 1.74m and frequency 28.43Hz propagates along a string.  What is the wave velocity in units of m/s?

Find the proportion of energy of a transverse wave that is transmitted across the join between two strings of differing density (ρ) and wave speed (c). Write your answer in terms of the impedances of the two strings (z1 = ρ1c1 and z2 = ρ2c2).

An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi