Author Question: The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five ... (Read 145 times)

ENagel · **on:** Jul 29, 2018

The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time. The threshold of hearing is 1.0 10-12 W/m2.

What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is 1.0 10-12 W/m2. A) 300 dB
B) 60 dB
C) 74 dB
D) 67 dB
E) 81 dB

Question 2

A 25-L container holds ideal hydrogen (H2 ) gas at a gauge pressure of 0.25 atm and a temperature of 0C.

What mass of hydrogen gas is in this container? The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R = 8.314 J/molK = 0.0821 L atm/mol K, and 1.00 atm = 101 kPa.
A) 1.4 g
B) 2.8 g
C) 4.2 g
D) 5.6 g
E) 6.3 g