Sound is recorded by a microphone using the vibrations caused by the sound on a diaphragm. If a microphone has a diaphragm diameter of 12.7 mm, how much energy does a singer singing at 90 dB supply to the diaphragm?

• A. 0.143 J
• B. 0.438 J
• C. 1.14 × 10^-2 J
• D. 1.27 × 10^-7 J
• E. 5.48 J
• F. 1.27× 10^-16 J

Answer: (D)