Why can sounds range from barely audible to deafeningly loud?

This is due to the frequency

Explanation:

All sounds are characterized by the frequency range they have, the frequency is the number of times a sound wave is repeated in an instant of time called period.

To better understand this concept, an image is attached in which you can see the different types of waves according to their frequency. We can see that the audible frequencies are within the range of 10^3 to 10^8 [Hz].

Outside this range sounds are imperceptible to the human ear, which is why we cannot hear sounds emitted by physical or similar phenomena. It should be noted that as the frequency of the sound wave increases, the audible capacity of the human ear decreases.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

i guess it’s a and b