When we hear a sound,we can identify its source from

Four sources of sound each of sound level $10\,dB$ are sounded together,the resultant intensity level will be ... $dB$

$A$ musical scale is constructed by providing intermediate frequencies between a note and its octave which:

The power of sound from the speaker of a radio is $20 \text{ mW}$. By turning the knob of the volume control,the power of the sound is increased to $200 \text{ mW}$. The power increase in decibels as compared to the original power is $.... \text{ dB}$.

In an orchestra,the musical sounds of different instruments are distinguished from one another by which of the following characteristics?

Two waves having sinusoidal waveforms have different wavelengths and different amplitudes. They will have: