Answer:
β = (-0.19 dB).
Explanation:
The formula which is used to calculate the decibel level of a sound is given by :

I is intensity of the sound of a ticking clock
watts per square meter
Since,

The intensity of a monster truck is converted into per square meter as follows:

So, Decibal level is :

So, the decibel level of the sound of a ticking clock is (-0.19 dB).