सामान्य बातचीत के दौरान ध्वनि की तीव्रता का स्तर लगभग किस श्रेणी में होता है?

A 'One-third Octave Band' is defined as a frequency band in which the upper cutoff frequency (fu) and lower cutoff frequency (fL) are related by:

Assertion (A): A-weighting network is widely used in environmental noise measurement. Reason (R): It approximates the frequency response of the human ear at low sound levels.