A sound wave of intensity I1 has an
amplitude 30 mm. Another wave of the
same frequency but of intensity I2, has an
amplitude of I 0 mrn. What is the value of (I1/I2) ?
(A) 3
(B) 9
(C) 27
(D) 81

Question

A sound wave of intensity I>1 has an
amplitude 30 mm. Another wave of the
same frequency but of intensity I>2, has an
amplitude of I 0 mrn. What is the value of (I>1/I>2) ?
(A) 3
(B) 9
(C) 27
(D) 81

anonymous · Answer

P = 0.5(omega)^2A^2(rho)v = 0.5(2*pi*f)^2*A^2(rho)v 
so P is variable to A^2 since v,f,and others are constant

I>1/I>2 = P1/P2 = (30/10)^2 = 9

anonymous · Answer

thank u