Calculate the sabins of absorption at 1000 Hz in a room that has dimensions of 11.00m wide x 15.00m long x 3.50m high. The room has: a. Plasterboard (12mm(1/2") in suspended ceiling grid  b. Walls are constructed of concrete blocks (coarse). c. The floor is covered with marble.   2. The absorption coefficients of the materials at 1000Hz are as follows: a. Plasterboard (12mm(1/2") in suspended ceiling grid – 0.04 b. Concrete blocks (coarse) - 0.29 c. Marble flooring -0.01   3. Compute the reverberation time (RT60) of the room. 4. Is the reverberation time appropriate for a room designed for speech? 5. As a designer, what will you recommend 5 to increase (or decrease) the reverberation time?

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Debye Theory of Solids

In solid-state physics, debye theory is used to estimate the phonons contributing to the specific heat capacity in a solid. It explains that the specific heat is a consequence of the vibrations of the atomic lattice of the solid, which is in contrast to the Einstein model. In the Einstein model, solids are treated as independent, non-interacting quantum harmonic oscillators. This model clearly explains the low-temperature dependence of the heat capacity, which is proportional to T3. This is known as Debye T3 law.