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IMSO 2014 Science International — Theory I Question 13

IMSO Science · IMSO 2014 Science International — Theory I

Question 13

The range of sound that can be heard by human is the sound which has ________
  1. Intensity of 20 dB – 20000 dB (dB is decibels)
  2. Amplitude of 20 mm – 20000 mm
  3. Frequency of 20 Hz – 20 kHz
  4. Energy of 20 J – 20 kJ