What is the approximate speed of sound in air? Which of the following represents

Question

What is the approximate speed of sound in air?             

Which of the following represents the heat (Q) for a substance going from its solid phase to its liquid phase (melting)?             

                            
           the capacitance is reduced to 1/4 of its original value                             
           the capacitance is reduced to 1/2 of its original value                             
           the capacitance remains unchanged                             
           the capacitance doubles                             
           the capacitance increases by a factor of 4

Explanation / Answer

applying mass conservation i.e Av=const

V2=(A1*V1)/A2=3.34m/s

the capacitance is reduced to 1/2 of its original value

345 m/s

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