Aperson standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 145 db . what sound level would this person experience if the captain shut down all but one engine?

The sound level is 138.97 dB.

Explanation:

Given that,

Sound level L= 145 dB

We need to calculate the intensity

Using formula of sound intensity

Put the value into the formula

We need to calculate the noise of one engine

Using formula of intensity

Put the value into the formula

We need to calculate the intensity level due to one engine

Using formula of sound intensity

Hence, The sound level is 138.97 dB

i think it is non rem sleep

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.