People can detect sounds ranging in frequency from ________ to ________.
A. 20 dB – 20,000 dB
B. 50 dB – 50,000 dB
C. 20 Hz – 20,000 Hz
D. 50 Hz – 20,000 Hz
Answer:C
People can detect sounds ranging in frequency from ________ to ________.
A. 20 dB – 20,000 dB
 B. 50 dB – 50,000 dB
 C. 20 Hz – 20,000 Hz
 D. 50 Hz – 20,000 Hz
