Question

Fill in the blanks :
1. Larger vibrations have ________________ amplitude.
2. Double glazing in windows is a method to ____________ sound
3. Frequencies below 20 Hz are called __________
4. The frequent to and fro movement of an object about its mean position .__________

Answer 1

Answer:

$1. \: 20000 \: hz \\ 3.Infrasound \\ 4.oscillatory motion.$