What is the pressure ratio for a sound that is 90 db spl?

Solution:

To calculate the pressure ratio for a sound for measuring sound, we use the following logarithmic formula of Sound Pressure Level  (SPL):

SPL =

where,

p = pressure to be measured

= reference pressure

=  

=  

pressure ratio is :

=

explanation:

the masses of the objects and the distance between them

b.a device that inputs heat into a cool object