Generally, a seismograph consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded on paper, magnetic tape, or another recording medium.
Conductive hearing loss occurs when the sound waves cannot be transferred in the ear due to the obstruction of any path such as the outer ear, the middle ear or the eardrum.
If a person suffers from middle ear infection then the blockage would be in the middle ear and the person would suffer from conductive hearing loss.
Due to this hearing loss the sound a person perceives becomes muffled and of softer due to which the sound that is already of lower frequency cannot be heard.
Therefore, the child suffering from the given impairment would find it difficult to hear soft sounds.
A is your answer. it cant be B because H doesn't equal 2 on both sides.it cant be C because S doesn't equal 3 on both sides of the equation . It also cant be D because Au doesn't equal 3 on the first part of the equation so your best answer is A. Hope this helps!!!!
