The standard measure used to compare sound intensities is the .

Decibels

Explanation:

Decibel is the unit which used to measure intensity of sound. Sound intensity is the power carried by the sound waves per unit area perpendicular to it.

measured in W/m²

In decibels:

With each unit rise of decibel, the sound intensity varies by a factor of 10.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this