A vacuum cleaner has a measured sound level of 70.8 dB. Recall that the intensity for the threshold of human hearing is ( I_0 ). What is the intensity of this sound? Answer in units of W/m(²).
a. ( I_0 )
b. ( 10(70.8/10) × I_0 )
c. ( 10(7.08) × I_0 )
d. ( 10(7.08/10) × I_0 )