Diatomic hydrogen explodes adiabatically to 36 times its original volume before

Question

Diatomic hydrogen explodes adiabatically to 36 times its original volume before its p atmospheric pressure. When ignited, what was its initial pressure? A) 150.9 Atm B) 92.88 Atm C) 30.9 Atm D) 756 Atm E) 25.2 Atm 12. y-2 sin(4 t A) 4 B) 4 3x). C) 1.33 Velocity of propagation of the wave is - D) 1.6 E) 0.75 13. A very loud train whistle has an acoustic power output of 110 watts. If the sound energy spreads out spherically, what is level in dB at a distance of 100 meters from the train? (o 10 Watts/m2) A) 63.36 dB B) 115 dB C) 105.6 dB D) 206.8 dB E) 89.42 dB 14. What is the root mean square velocity of gasX molecules at a temperature of 50 C? (R-8.314 J/mole-K, NA -6.02 x 10m, and the molecular mass of gasX-25 grams) A) 412.5 m/s B) 567.7 m/s C) 230 m/s D) 1250 m/s E) 400 m/s 2 15. What is the entropy change for 7 moles of a polyatomic ideal gas isobarie process from s C to 160 26 A) 257.6 J/K B) 103.2 J/K C) 10.5 J/K D) 112 J/K E) 2.63 J/K S C If is engine A gasoline engine with an efficiency of 26% operates between a hightemperature T and a low temperature T, operates with Carnot efficiency, what is the high-side temperature T? A) -138 oC B) 24.44 °C C) 89.16 C D) 73.32 C E) -57.59 °C CB 17. If the distance between a point sound source and a dB detector is increased by a factor of 3 , what will be the reduction in intensity level? 434N B) 2.49N C) 9.542 N D) 7.47N E) 10.8 N

Explanation / Answer

12.

y= 2sin(4t-3x)

Comparing above eqn with y=Asin(?t-kx)

?= 2?f = 4

k= 2?/? = 3

v=f*? = ?/k= -4/3 = 1.33m/s

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