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Author Question: The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five ... (Read 148 times)

ENagel

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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


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macmac

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Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

B


ENagel

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Reply 2 on: Jul 29, 2018
:D TYSM

atrochim

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Reply 3 on: Yesterday
Wow, this really help

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