the howler monkey is the loudest land animal and can be heard up to a distance of 9.8 km. assume the acoustic output of a howler to be uniform in all directions. the distance at which the intensity level of a howler's call is 25 db, in si units, is closest to:

A sound wave's intensity is measured in decibels (dB) and is based on logarithms with base 10. The sound intensity increases by a factor of ten for every 10 dB increase in intensity level.

The power per unit area carried by a wave Sound intensity level: a unitless quantity indicating the level of sound in relation to a specified standard. The ratio of the pressure amplitude to a reference pressure is referred to as the sound pressure level.

The distance at the hearing threshold is 9.8km.

As a result, the intensity, I1=1012 W/m2 for a distance r1=9.8km

As a result, the intensity level for 25DB is determined as 25DB=10 log(I2/1012).

As a result, I2=3.1621010 W/m2.

The distance at which the intensity level is 25DB is calculated using I1/I2=(r1/r2)2 or r2=[r12(l1/l2)].

=√[(9.8×10³)²×(10⁻¹²/3.162×10⁻¹⁰)]

=551m

In S.I units, the distance at which the intensity level of a howler's call is 25 DB is closest to 551m.

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