Sound is detected when a sound wave causes the tympanic membrane to vibrate. Typically, the diameter is 8.4 mm. How much energy is delivered at 20 dB?
a) (1.0 × 10⁻⁶) J
b) (1.0 × 10⁻⁷) J
c) (1.0 × 10⁻⁸) J
d) (1.0 × 10⁻⁹) J