Damien is in his car testing out his new sound system. He slowly turns up the volume from zero, to one, to two, etc. He only begins hearing the music once the volume reaches level four. The moment Damien hears his music it reaches his:

Damien is in his car testing out his new sound system. He slowly turns up the volume from zero, to one, to two, etc. The moment Damien hears his music, it reaches his Brain.

The ability to hear sound is dependent on a complicated sequence of processes that convert sound waves in the air into electrical impulses.

Damien's hearing starts with his pinna (the outer part of the ear). The pinna gathers the sound waves from the sound system and sends them to the eardrum. The eardrum vibrates and echoes when the sound waves strike it. These sound waves are sent further to the ossicles of the middle ear.

The ossicles of the middle ear amplify these sound waves and send them to the cochlea. The hair cells in the cochlea secrete chemicals that detect these sound waves and create electric impulses.

At the tail end of the inner ear, the auditory nerves close to the cochlea send these electrical impulses to the Brain.

Therefore, we can conclude that the moment Damien hears his music, it means that the electrical impulse has reached his Brain.

Learn more about ear structure here:

link

Explanation :The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified. The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane.

c. flammable gases, patient lying in standing water, combustible liquids near the victim