One violin creates a sound whose intensity level is 60dB. Find the intensity level of 16 violins, each playing at this intensity.

72.04 dB.

Explanation:

The intensity level of 60dB corresponds to the sound intensity given by the equation

where

solving for we get:

Now, when 16 violins are playing the intensity becomes

which on the decibel scale gives

.

Thus, playing 16 violins together gives the intensity level of 72 dB.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.