In a very quiet room, a mic's output voltage is $0\mathrm{.}5V.$ When this mic is moved to a busy street, what will be the output voltage?

What about moving to station with a train passing through? And two trains simultaneously?

$($Use this table $6\mathrm{.}1$ as a reference; for two trains, just assume the their sounds are additive; no need to consider other factors$)$

For table $6\mathrm{.}1,$ the levels of sound we hear around us are described in terms of decibels, as a ratio to the quietest sound we are capable of hearing. Table $6\mathrm{.}1$ shows approximate levels for these sounds.

Table$6\mathrm{.}1$ Magnitudesof common sounds, in decibels

Threshold of hearing $0$

Rustle of leaves $10$

Very quiet room $20$

Average room $40$

Conversation $60$

Busy street $70$

Loud radio $80$

Train through station $90$

Riveter $100$

Threshold of discomfort $120$

Threshold of pain $140$

Damage to eardrum $160$