Question

1) Suppose you have a closed rigid container of air at 20 Celsius on the surface of the Earth. We change the temperature of the container to 72 Celsius, leaving it closed, and read a pressure gauge attached to the container. Initially the reading was 101 KPa (kilopascals, or 1000 N/m2). What is the new reading? Give your answer in KPa.

2)

Match these sounds with the sound energy in dB (decibels).

-       A.       B.       C.       D.       E.       F.    0 dB       -       A.       B.       C.       D.       E.       F.    20 dB       -       A.       B.       C.       D.       E.       F.    40 dB       -       A.       B.       C.       D.       E.       F.    80 dB       -       A.       B.       C.       D.       E.       F.    100 db       -       A.       B.       C.       D.       E.       F.    140 dB

A. Whispering voice B. Classroom lecture C. Quiet afternoon at home D. Hearing threshold E. Severe pain and damage with short exposure F. Hearing damage from prolonged repeated exposure

Answer 1

1)

For ideal gases equation of state is

When Volume is held constant, or

Final pressure of the container is

2)

	Hearing threshold
	Whispering voice
	Quiet afternoon at home
	Classroom lecture
	Hearing damage with prolonged repeated exposure
	Severe pain and damage with short exposure